Optimization and characterization of gelatin and chitosan extracted from fish and shrimp wasteAIT BOULAHSEN M, CHAIRI H, LAGLAOUI A, ARAKRAK A, ZANTAR S, BAKKALI M and HASSANI ME3S Web Conf., 37 (2018) 02006DOI: https://doi.org/10.1051/e3sconf/20183702006