中国科学院数学与系统科学研究院期刊网
On the Unitriangular Group over the Integral Ring(Ⅲ)
He Guo LIU, Zuo Hui WU
Acta Mathematica Sinica, Chinese Series . 2012, (5): 769 -780 .  DOI: 10.12386/A2012sxxb0074