@article{PORMA_2006__63_4_53310,
     author = {Marcelo, Agust{\'\i}n and Marcelo, F\'elix and Rodr{\'\i}guez, C\'esar},
     title = {A note on basic free modules and the  condition.},
     journal = {Portugaliae mathematica},
     pages = {401--405},
     publisher = {mathdoc},
     volume = {63},
     number = {4},
     year = {2006},
     zbl = {1118.13006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2006__63_4_53310/}
}