“STUDY OF PHYSICO-CHEMICAL PROPERTIES OF SULPHUR, NITROGEN AND PHOSPHORUS-CONTAINING OLIGOMERS” (2023) American Journal of Engineering , Mechanics and Architecture (2993-2637), 1(7), pp. 104–107. Available at: https://www.grnjournal.us/index.php/AJEMA/article/view/841 (Accessed: 4 February 2026).