Ugrinovic, V., Radisavljevic, A., Markovic, M., Panic, V., & Veljovic, D. (2025). Semi-interpenetrating network hydrogels based on poly(methacrylic acid) and natural polymers gelatin, chitosan, and alginate, for potential biomedical applications. Macedonian Journal of Chemistry and Chemical Engineering, 44(1), 67–81. https://doi.org/10.20450/mjcce.2025.2999 (Original work published May 28, 2025)