1.
Tepoyan L. DEGENERATE FIRST ORDER DIFFERENTIAL-OPERATOR EQUATIONS. Proc. YSU A: Phys. Math. Sci. [Internet]. 2019 Dec. 16 [cited 2024 May 12];53(3 (250):163-9. Available from: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol53_no3_2019_pp163-169