“Manufacture and General Cost Analysis of O Natural Biopolymerfrom the Calyx of Physalis Peruviana 1 (uvilla)”. Revista Universidad de Guayaquil 122, no. 1 (January 4, 2016): 12–18. Accessed December 5, 2025. https://revistas.ug.edu.ec/index.php/rug/article/view/257.