Sulaimonova, Gulorom Nematovna. “The Theory of Vibrational Oscillation of the Singing Voice”. European Journal of Life Safety and Stability (2660-9630) 24 (December 7, 2022): 16-19. Accessed October 5, 2025. http://www.ejlss.indexedresearch.org/index.php/ejlss/article/view/913.