Here you have the references for Isabel dAlmeida, Agostinho da Silva and Diogo Balula work:

• 
  

• Adidas. (2022). Materials. Adidas. Retrieved January 10, 2022, from https://www.adidasgroup.com/en/sustainability/products/materials/#/leather/ 

  Afum, E., Agyabeng-Mensah, Y., Baah, C., Agyapong, G. K., Lascano Armas, J. A., & Al Farooque, O. (2022). Prioritizing zero-waste performance and green differentiation advantage through the Prism of circular principles adoption: A mediated approach. Journal of Cleaner Production, 361, 132182. https://doi.org/10.1016/j.jclepro.2022.132182 

  Ahmad, M., Jiang, P., Majeed, A., Umar, M., Khan, Z., & Muhammad, S. (2020). The dynamic impact of natural resources, technological innovations and economic growth on ecological footprint: An advanced panel data estimation. Resources Policy, 69(July), 101817. https://doi.org/10.1016/j.resourpol.2020.101817 

  Alam, A. A. M. D., Rahman, M., Yazdifar, H., & Abbasi, K. (2022). SMEs respond to climate change: Evidence from developing countries. Technological Forecasting and Social Change, 185, 122087. https://doi.org/10.1016/j.techfore.2022.122087 

  APICCAPS (2021). Portuguese Footwear, Components, Leather Goods Manufacturers' Association. The Portuguese Footwear Industry. Retrieved from https://www.apiccaps.pt/library/media_uploads/facts-numbers-2021.pdf 

  Batista, F., Matos, J. E., & Matos, M. C. (2017). Assessing the Competitiveness of the Portuguese Footwear Sector. GEE Papers, 66, 1–32. Retrieved from  https://www.gee.gov.pt/RePEc/WorkingPapers/GEE_PAPERS_66.pdf 

  Belhadi, A., Kamble, S.S., Jabbour, C.J.C., Mani, V., Khan, S.A.R,. Touriki. F.e. (2022). A self-assessment tool for evaluating the integration of circular economy and industry 4.0 principles in closed-loop supply chains. International Journal of Production Economics, 245, 108372. https://doi.org/10.1016/j.ijpe.2021.108372 

  Büschgens, T., Bausch, A., & Balkin, D. B. (2013). Organizational Culture and Innovation: A Meta[1]Analytic Review. Journal of Product Innovation Management, 30(4), 763–781. https://doi.org/https://doi.org/10.1111/jpim.12021 

  Calza, F., Parmentola, A., & Tutore, I. (2017). Types of green innovations: Ways of implementation in a non-green industry. Sustainability (Switzerland), 9(8). https://doi.org/10.3390/su9081301 

  Cardoso, A. F. S. P., & Torkkeli, M. (2014). Innovation in footwear companies - does it pay off? Journal of Engineering, Design and Technology, 12(1), 128–154. https://doi.org/10.1108/JEDT-09-2010-0063 

  Chesbrough, H. (2012). Open innovation: Where we've been and where we're going. Research Technology Management, 55(4), 20–27. https://doi.org/10.5437/08956308X5504085 

  Chesbrough, H. (2017). The future of open innovation. Research Technology Management, 60(1), 35–38. https://doi.org/10.1080/08956308.2017.1255054 

  Ciasullo, M. V., Maione, G., Torre, C., & Troisi, O. (2017). What about Sustainability? An Empirical Analysis of Consumers' Purchasing Behavior in Fashion Context. Sustainability, 9(9), 1617.  https://doi.org/10.3390/su9091617 

  Climate Works Foundation (2022). Let's end the climate crisis. https://www.climateworks.org/ 

  De Jesus, A. & Mendonça, S. 2018. Lost in Transition? Drivers and Barriers in the Eco-innovation Road to the Circular Economy. Ecological Economics, 145(2018): 75-89. https://doi.org/10.1016/j.ecolecon.2017.08.001 

  Della Peruta, M. R., Del Giudice, M., Lombardi, R., & Soto-Acosta, P. (2018). Open Innovation, Product Development, and Inter-Company Relationships Within Regional Knowledge Clusters. Journal of the Knowledge Economy, 9(2), 680–693. https://doi.org/10.1007/s13132-016-0356-x 

  Diniz, F., Vaz, R. & Duarte, N. (2015) Inovação de Produto na Indústria Portuguesa do Calçado. Rev Sodebras 10(112):124–129.

  Dragomir, V. D., & Dumitru, M. (2022). Practical solutions for circular business models in the fashion industry. Cleaner Logistics and Supply Chain, 4, 100040. https://doi.org/10.1016/j.clscn.2022.100040 

  Dwivedi, A., Moktadir, M. A., Jabbour, C. J. C., & de Carvalho, D. E. (2022). Integrating the circular economy and industry 4.0 for sustainable development: Implications for responsible footwear production in a big data-driven world. Technological Forecasting and Social Change, 175, 121335. https://doi.org/10.1016/j.techfore.2021.121335 

  Ellen MacArthur Foundation. (2017). Concept – What is a circular economy? A framework for an economy that is restorative and regenerative by design. https://www.ellenmacarthurfoundation.org 

  Gomes de Oliveira, L. (2022). Sustainable practices in slow and fast fashion stores: What does the customer perceive? Cleaner Engineering and Technology, 6, ISSN: 2666-7908. https://doi.org/10.1016/j.clet.2022.100413 

  Gomes, P., Fernandes, A., & Sousa, S. (2020). A Review of the Portuguese Footwear Industry: Evolution, Current Status, and Future Trends. Journal of Open Innovation: Technology, Market, and Complexity, 6(4), 123.

  GRI - Global initiative report (2022) https://www.globalreporting.org/ 

  Guest, G., Bunce, A., & Johnson, L. (2006). How Many Interviews Are Enough?: An Experiment with Data Saturation and Variability. Field Methods, 18(1), 59–82. https://doi.org/10.1177/1525822X05279903 

  Guo, S. (2023). Applications of Blockchain Technology in Sustainable Fashion Supply Chains: Operational Transparency and Environmental Efforts. IEEE Transactions on Engineering Management, 70(4). Retrieved from https://ieeexplore.ieee.org/document/9279323 

  Huang, J. W., & Li, Y. H. (2017). Green Innovation and Performance: The View of Organizational Capability and Social Reciprocity. Journal of Business Ethics, 145(2), 309–324. https://doi.org/10.1007/s10551-015-2903-y 

  Hur, E. (2019). Perceptions and attitudes towards sustainable fashion design: Challenges and opportunities for implementing sustainability in fashion. International Journal of Fashion Design, Technology and Education, 12(2). https://doi.org/10.1080/17543266.2019.1572789  

  ISO, 2015. ISO. Online available at: https://www.iso.org/standard/60857.html. 

  Jestratijevic, I., Maystorovich, I., & Vrabič-Brodnjak, U. (2022). The 7 Rs sustainable packaging framework: Systematic review of sustainable packaging solutions in the apparel and footwear industry. Sustainable Production and Consumption, 30, 331-340.  https://doi.org/10.1016/j.spc.2021.12.013  

  Jia, L., Xu, R., Shen, Z., & Song, M. (2023). Which type of innovation is more conducive to inclusive green growth: Independent innovation or imitation innovation? Journal of Cleaner Production, 406, 137026. https://doi.org/10.1016/j.jclepro.2023.137026 

  Kaziur, P., Mikołajczyk, Z., Kłonowska, M., & Woźniak, B. (2022). Design methodology and technology of textile footwear. Materials, 15(16), 5720. https://doi.org/10.3390/ma15165720 

  Kumar, A., Prakash, G., & Kumar, G. (2021). Does environmentally responsible purchase intention matter for consumers? A predictive sustainable model developed through an empirical study. Journal of Retailing and Consumer Services, 58(July 2020), 102270. https://doi.org/10.1016/j.jretconser.2020.102270 

  Kusumo, K., Mahlia, T.M.I., Pradhan, S, Ong, H.C., Silitonga, A.S., Fattah, I.M.R., Nghiem, L.D. & M. Mofijur. (2022). A framework to assess indicators of the circular economy in biological systems. Environmental Technology & Innovation, 28, 102945. https://doi.org/10.1016/j.eti.2022.102945 

  Marques, A., Ferreira, J. J., & Ribeiro, F. (2021). The COVID-19 Pandemic and Its Impact on the Portuguese Footwear Industry. Sustainability, 13(11), 6032.

  Mason, J. (2012), "Qualitative Researching". 2nd ed., Sage, Los Angeles, USA.

  Mehta, P. and Chahal, H.S. (2021), "Consumer attitude towards green products: revisiting the profile of green consumers using segmentation approach", Management of Environmental Quality, Vol. 32 No. 5, pp. 902-928. https://doi.org/10.1108/MEQ-07-2020-0133 

  Muthu, S. S., & Li, Y. (2021). The environmental impact of footwear and footwear materials. Handbook of Footwear Design and Manufacture (Second Edition), 305-320. https://doi.org/10.1016/B978-0-12-821606-4.00015-6 

  Muthu, S.S. & Li, y. (2021). Chapter 12 - The environmental impact of footwear and footwear materials. In A. Luximon (Ed.), Handbook of Footwear Design and Manufacture (Second Edition), The Textile Institute Book Series, (pp. 305-320). Woodhead Publishing. https://doi.org/10.1016/B978-0-12-821606-4.00015-6 

  Oke, A. (2007). Innovation types and innovation management practices in service companies. International Journal of Operations and Production Management, 27(6), 564–587. https://doi.org/10.1108/01443570710750268 

  Quantis (2018). Measuring Fashion - Environmental Impact of the Global Apparel and Footwear Industries Study. https://quantis.com/wp-content/uploads/2018/03/measuringfashion_globalimpactstudy_full-report_quantis_cwf_2018a.pdf 

  Rauter, R., Globocnik, D., Perl-Vorbach, E., & Baumgartner, R. J. (2019). Open innovation and its effects on economic and sustainability innovation performance. Journal of Innovation and Knowledge, 4(4), 226–233. https://doi.org/10.1016/j.jik.2018.03.004 

  Ribeiro, M. C., Dias Pinto, R. J., Silva, F. V., & Martins da Silva, F. (2021). International recognition of own brands-the case of the Portuguese footwear industry. Studies in Business & Economics, 16(3), 44-59. https://doi.org/10.2478/sbe-2021-0044. 

  Rinaldi, F. R., Di Bernardino, C., Cram-Martos, V., & Pisani, M. T. (2022). Traceability and transparency: Enhancing sustainability and circularity in garment and footwear. Sustainability: Science, Practice and Policy, 18(1), 132-141. https://doi.org/10.1080/15487733.2022.2028454 

  Rizos, V., van der Gaast, W., Behrens, A. & Hofman, E. (2016). Implementation of Circular Economy Business Models by Small and Medium-Sized Enterprises (SMEs): Barriers and Enablers. Sustainability, 8(11): 1212. https://doi.org/10.3390/su8111212 

  Rosa, P., Sassanelli, C., Urbinati, A., Chiaroni, D., & Terzi, S. (2020). Assessing relations between Circular Economy and Industry 4.0: a systematic literature review. International Journal of Production Research, 58(6), 1662-1687. https://doi.org/10.1080/00207543.2019.1692588 

  Sajadieh, S. M., Son, Y. H., & Noh, S. D. (2022). A conceptual definition and future directions of urban smart factory for sustainable manufacturing. Sustainability, 14(3), 1221. https://doi.org/10.3390/su14031221 

  Saunders, M. N. K., Lewis, P., & Thornhill, A. (2019). Research Methods for Business Students. Harlow: Pearson Education Limited.

  Skackauskiene, I., & Vilkaite-Vaitone, N. (2023). Green Marketing and Customers' Purchasing Behavior: A Systematic Literature Review for Future Research Agenda. Energies, 16(1), 456. https://doi.org/10.3390/en16010456 

  Stead, J.G. and Stead, W.E. (2008), "Sustainable strategic management: an evolutionary perspective", International Journal of Sustainable and Strategic Management, 1, pp. 62-81. https://doi.org/10.1504/IJSSM.2008.018127 

  T. Staikos & S. Rahimifard (2007) An end-of-life decision support tool for product recovery considerations in the footwear industry, International Journal of Computer Integrated Manufacturing, 20:6, 602-615, https://doi.org/10.1080/09511920701416549  

  Vale, M., & Caldeira, J. (2007). Proximity and knowledge governance in localized production systems: The footwear industry in the north region of Portugal. European Planning Studies, 15(4), 531–548. https://doi.org/10.1080/09654310601134854 

  Vale, M., & Caldeira, J. (2008). Fashion and the governance of knowledge in a traditional industry: The case of the footwear sectoral innovation system in the northern region of Portugal. Economics of Innovation and New Technology, 17(1), 61–78. https://doi.org/10.1080/10438590701279318 

  Van Rensburg, M. L., Nkomo, S. L., & Mkhize, N. M. (2020). Life cycle and End-of-Life management options in the footwear industry: A review. Waste Management & Research, 38(6), 599-613. https://doi.org/10.1177/0734242X20908938 

  Van Rensburg, M.L., Nkomo, S.L & Mkhize. N.M. (2020). Life cycle and End-of-Life management options in the footwear industry: A review. Waste Management & Research 2020, Vol. 38(6) 599–613. https://doi.org/10.1177/0734242X20908938 

  Vaz, R. (2023). Firm growth in the Portuguese footwear industry: The location dilemma. The Annals of Regional Science, 70(2). https://doi.org/10.1007/s00168-022-01152-8 

  Velenturf A.P.M. & Purnell, P. (2017). Resource Recovery from Waste: Restoring the Balance between Resource Scarcity and Waste Overload. Sustainability, 9(9), 1603. https://doi.org/10.3390/su9091603 

  Wang, M., Pang, S., Hmani, I. & Li, C. (2020). Towards sustainable development: how does technological innovation drive the increase in green total factor productivity? Sustain. Dev., 29 (1), pp. 217-227. https://doi.org/10.1002/sd.2142 

  Wang, Y., & Xue, W. (2019). Study on industrial structure upgrading based on ecological innovation. Ekoloji, 28(107), 1815–1823. Retrieved from https://www.ekolojidergisi.com/article/study-on-industrial-structure-upgrading-based-on-ecological-innovation-5809 

  WFW-World footwear, 2023, April 3, Portuguese footwear industry to invest 50 million to be the most modern in the world. Retrieved from https://www.worldfootwear.com/news/portuguese-footwear-industry-to-invest-50-million-to-be-the-most-modern-in-the-world/8703.html 

  Yin, R.K. (2014),-" Case study research: Design and methods (applied social research methods)", Thousand Oaks, California: Sage publications.

  Ziemba, E., Eisenbardt, M., Mullins, R. & Dettmer, S. (2022) Consumer Engagement in Business Process Innovation–ICT Companies Cases from Poland and UK, Journal of Computer Information Systems, 62:2, 302-315. https://doi.org/10.1080/08874417.2020.1808865  

Thanks for joining me!

Good company in a journey makes the way seem shorter. — Izaak Walton