Vasco Costa Delgado, Carolina, Gabriela Alexandra da Cunha Santos Forman, and Rebecca Louise Antoinette Breuer. “Organic Waste Bio-Based Materials for 3D Extrusion: Eggshells, Shells Sand and Coffee Grains With Sodium Alginate”. Convergences - Journal of Research and Arts Education 15, no. 29 (May 31, 2022): 77–87. Accessed December 27, 2025. https://convergencias.ipcb.pt/index.php/convergences/article/view/133.