@article{PM_1993_1993_1_a4,
     author = {Ries, Heather},
     title = {Extensiones de pseudoenteros.},
     journal = {Publicacions matem\`atiques},
     pages = {387-401},
     publisher = {mathdoc},
     volume = {37},
     number = {2},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1993_1993_1_a4/}
}