References
- Auslander , M. and Reiten , I. 1991 . Applications of contravariantly finite subcategories . Adv. Math , 86 : 111 – 152 .
- Enochs , Edgar E. 1981 . Injective and flat covers, envelopes and resolvents . Israel J. Math , 39 : 189 – 209 .
- Enochs , E. 1963 . Torsion free covering modules . Proc. Amer. Math. Soc , 14 : 884 – 889 .
- Enochs , E. 1971 . Torsion free covering modules II . Arch. Math , 22 : 37 – 52 . (basel)
- Enochs , E. , Carcía Rozas , J.R. and Oyonarate , Luis . 1971 . Compact cogalois groups . Math. Proc. Cambridge phil soc , 22 To appear in
- Enochs E. Jenda O. Torrecillas B. Xu Ju Torsion theory relative to ext preprint
- Jinzhong , Xu . 1996 . “ Flat covers of modules ” . In Lecture notes in mathematics , Vol. 1634 , Springer .