Shaldanbayev A.Sh., Shaldanbayeva A.А., & Shaldanbay B.A. (2019). ON PROJECTIONAL ORTHOGONAL BASIS OF A LINEAR NON-SELF -ADJOINT OPERATOR. Известия НАН РК. Серия физико-математическая, (2), 79–89. извлечено от https://journals.nauka-nanrk.kz/physics-mathematics/article/view/1182