E. Z. Avakyan and S. L. Avakyan, “Description of scalar mesons as two and four quark states”, Журнал Белорусского государственного университета. Физика, no. 1, pp. 72–87, Feb. 2019, Accessed: Jul. 17, 2026. [Online]. Available: https://journals.bsu.by/index.php/physics/article/view/1385