中国科学院数学与系统科学研究院期刊网
AMS
Reduction Theorems for Principal and Classical Connections
Miroslav DOUPOVEC, Wlodzimierz M.MIKULSKI
Acta Mathematica Sinica . 2010, (1): 169 -184 .  DOI: 10.1007/s10114-010-7333-2