@article{SF_1997__54_2_135535,
     author = {J.O. Loyola},
     title = {E-free objects in {E-vari\'et\'es} of inverse rings.},
     journal = {Semigroup forum},
     pages = {375--380},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {1997},
     zbl = {0880.20049},
     url = {http://geodesic.mathdoc.fr/item/SF_1997__54_2_135535/}
}