Войтик, Татьяна Геннадиевна, and Геннадий Степанович Полетаев. 2016. “Justification of Conditions for Unique Solvability of Matrix Equations With Two Triangular Unknowns and Mutually Inverse Coefficients”. Technology Audit and Production Reserves 4 (2(30):73-77. https://doi.org/10.15587/2312-8372.2016.75969.