1.
Tepoyan L, Grigoryan H. ON DEGENERATE NONSELF-ADJOINT DIFFERENTIAL EQUATIONS OF FOURTH ORDER. Proc. YSU A: Phys. Math. Sci. [Internet]. 2012 Dec. 1 [cited 2024 Nov. 25];46(3 (229):29-33. Available from: https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol46_no3_2012_pp029-033