@article{AFST_1980_5_2_2_157_0,
     author = {Fleckinger, Jacqueline},
     title = {Estimation des valeurs propres d'op\'erateurs elliptiques sur des ouverts non born\'es},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {157--180},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {5e s{\'e}rie, 2},
     number = {2},
     year = {1980},
     mrnumber = {595197},
     zbl = {0452.35094},
     language = {fr},
     url = {http://archive.numdam.org/item/AFST_1980_5_2_2_157_0/}
}