Sáez-Gastón, Roberto, Dairon Iglesias-Guevara, Alicia Casariego-Año, Carlos A. Peniche-Covas, and Yaimara Solís-Moré. 2024. “Development of PH Indicator Films Based on Chitosan and Beeswax”. Revista Cubana De Química 36 (1):1-14. https://cubanaquimica.uo.edu.cu/index.php/cq/article/view/5356.