@article{CMUC_2003_44_4_a0,
     author = {Bican, Ladislav},
     title = {Relatively exact modules},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {569--576},
     year = {2003},
     volume = {44},
     number = {4},
     mrnumber = {2062873},
     zbl = {1101.16023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2003_44_4_a0/}
}