中国科学院数学与系统科学研究院期刊网
AMS
Some Remarks on Projective Generators and Injective Cogenerators
Li LIANG, Nan Qing DING, Gang YANG
Acta Mathematica Sinica . 2014, (12): 2063 -2078 .  DOI: 10.1007/s10114-014-3227-z