@article{M2AN_1971__5_3_82_0,
     author = {Chambat, Mich\`ele},
     title = {Br\`eve communication. {Localisation} de valeurs propres, r\'egions de {Gudkov}},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {82--88},
     publisher = {Dunod},
     address = {Paris},
     volume = {5},
     number = {R3},
     year = {1971},
     mrnumber = {309287},
     zbl = {0247.65024},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/M2AN_1971__5_3_82_0/}
}