A.Sh. Shaldanbayev, A.A. Shaldanbayeva, A.Zh. Beisebayeva, и B.A. Shaldanbay. «INVERSE PROBLEM OF STURM-LIOUVILLE OPERATOR WITH NON-SEPARATED BOUNDARY VALUE CONDITIONS AND SYMMETRIC POTENTIAL». Известия НАН РК. Серия физико-математическая, no. 6 (декабрь 12, 2019): 52–62. просмотрено январь 18, 2025. http://189185.vm7pq.group/physics-mathematics/article/view/1693.