@article{CMUC_1992_33_1_a0,
     author = {Bican, Ladislav and Torrecillas, Blas},
     title = {QTAG torsionfree modules},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {1--20},
     year = {1992},
     volume = {33},
     number = {1},
     mrnumber = {1173740},
     zbl = {0765.16009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1992_33_1_a0/}
}