A. Tumanyan, “ON NOETHERICITY AND INDEX OF DIFFERENTIAL OPERATORS IN ANISOTROPIC WEIGHTED SOBOLEV SPACES”, Proc. YSU A: Phys. Math. Sci., vol. 50, no. 3 (241), pp. 63–69, Oct. 2016, doi: 10.46991/PYSU:A/2016.50.3.063.