Karaprtyan, G. A., and A. A. Darbinyan. 2023. “NOETHERICITY OF SEMI-ELLIPTICAL OPERATOR WITH CONSTANT COEFFICIENTS IN THE RANGE”. Proceedings of the YSU A: Physical and Mathematical Sciences 42 (3 (217): 16-24. https://doi.org/10.46991/PYSUA.2008.42.3.016.