@article{ELA_2002__9__a6,
     author = {Bendoukha, Berrabah},
     title = {Deux mod\`eles pour les op\'erateurs de contraction},
     journal = {The electronic journal of linear algebra},
     pages = {171--189},
     publisher = {mathdoc},
     volume = {9},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2002__9__a6/}
}