@article{EXMATH_1999_1999_1_a2,
     author = {Vieites Rodr{\'\i}guez, A. M. and Casas Mir\'as, J. M.},
     title = {Derivaciones de m\'odulos cruzados.},
     journal = {Extracta mathematicae},
     pages = {63-67},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1999_1999_1_a2/}
}