Study of the composition of oil and fat waste - soapstock obtained by a combined method of cottonseed oil refinationNadira Saidiganiyeva, Gulmira Yelibayeva, Aigul Naukenova and Barna KhamitovaE3S Web Conf., 719 (2026) 01002DOI: https://doi.org/10.1051/e3sconf/202671901002