Kulyk, Kostyantyn M., Maryna A. Ratner, and Volodymyr V. Yanovsky. “Particles With Internal Degrees of Freedom”. East European Journal of Physics, no. 3 (September 7, 2026): 228-238. Accessed September 18, 2026. https://periodicals.karazin.ua/eejp/article/view/29943.