中国科学院数学与系统科学研究院期刊网
Some Elements of Finite Order in K2Q
Xiao Yun CHENG, Jian Guo XIA, Hou Rong QIN
Acta Mathematica Sinica . 2007, (5): 819 -826 .  DOI: 10.1007/s10114-005-0852-6