Norbosambuev Tsyrendorzhi D. «Good formal matrix rings over residue class rings» // Tomsk State University Journal of Mathematics and Mechanics 2023. №85 C.32-42
Timoshenko Egor A., Norbosambuev Tsyrendorzhi D. «On a class of 3-good formal matrix rings» // Tomsk State University Journal of Mathematics and Mechanics 2020. №67 C.55-62