Olzhabay, A.T., P.I. Urkimayeva, Z.A. Kenessova, Sh.O. Yespenbetova, and El-Sayed Negim. 2022. “Development of a Technology for Processing Waste Plastic Bottles and Bags to Obtain Various Types of Biodegradable Polymer Films”. International Journal of Biology and Chemistry 15 (1):107-16. https://doi.org/10.26577/ijbch.2022.v15.i1.012.