1. 1. B. V. Zabavsky, O. M. Romaniv, "Noncommutative rings with elementary reduction of matrices," Visn. L'viv. Univ., Ser. Mekh.-Mat., 49, 16-20 (1998) (in Ukrainian).
2. 2. D. A. Tuganbaev, "Laurent rings," Fundam. Prikl. Mat., 12, No. 3, 151-224 (2006)
3. English translation: J. Math. Sci., 149, No. 3, 1286-1337 (2008), https://doi.org/10.1007/s10958-008-0066-4
4. 3. K. Amano, T. Kuzumaki, "On Euclidean algorithm and skew Laurent power series rings," Bull. Fac. Gen. Ed. Gifu Univ., 38, 233-237 (1995).
5. 4. P. M. Cohn, "Right principal Bezout domains," J. London Math. Soc., s2-35, No. 2, 251-262 (1987), https://doi.org/10.1112/jlms/s2-35.2.251