Akhtyamov A, Sadovnichy V, Sultanaev Y. Generalizations of Borg’s uniqueness theorem to the case of nonseparated boundary conditions. EMJ [Internet]. 2012 Dec. 30 [cited 2025 Oct. 6];3(4):10-22. Available from: https://emj.enu.kz/index.php/main/article/view/803