@article{MSC_1999_1999_1_a17,
     author = {Mas Grimalt, Margalida and Torrens, Joan and Calvo, Tomasa and Carbonell, Marc},
     title = {Operadores idempotentes en una cadena finita.},
     journal = {Mathware & soft computing},
     pages = {235-247},
     year = {1999},
     volume = {6},
     number = {2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MSC_1999_1999_1_a17/}
}