Avakyan, E. Z. The Role of Intermediate Scalar States in the Description of Pseudoscalar Meson Scattering Processes / E. Z. Avakyan, S. L. Avakyan // Nonlinear Dynamics and Applications : Proceedings of the Twenty nine Anniversary Seminar NPCS'2022, Minsk, June 21-24, 2022 / editors V. A. Shaparau [et al.]. – Minsk : Pravo i Ekonomika, 2022. – P. 40–48.