@article{01204392, title = {Purity and direct summands.}, journal = {Divulgaciones Matem\'aticas}, volume = {4}, year = {1996}, pages = {49-53}, zbl = {0909.16002}, language = {en}, url = {http://dml.mathdoc.fr/item/01204392} }
Oneto R., Ángel V. Purity and direct summands.. Divulgaciones Matemáticas, Tome 4 (1996) pp. 49-53. http://gdmltest.u-ga.fr/item/01204392/