1. Hua Luogeng and Wan Zhexian, Classical Groups (in Chinese), Shanghai Science and Technology Press, 1963.
2. McDonald B. R., Geometric Algebra over Local Rings, Dekker, New York, 1976.
3. Lacroix N. H. J., Two-dimensional Linear Groups over Local Rings,Canada J. Math., 21 (1969), 106–135.
4. Atiyah M. F. and MacDonald I. G., Introduction to Commutative Algebra, Addison-Wesley Publishing Company, 1969.
5. An Jianbei, Structure of Two-dimensional Linear Groups over Semi-local Rings (in Chinese),Acta Mathematica Sinica, 27 (1984), 536–539.