@article{PORMA_1982__41_1-4_115507,
     author = {Gossez, Jean-Pierre and Lami Dozo, Enrique},
     title = {On an estimate for the principal eigenvalue of a linear elliptic problem},
     journal = {Portugaliae mathematica},
     pages = {347--350},
     publisher = {mathdoc},
     volume = {41},
     number = {1-4},
     year = {1982},
     mrnumber = {0766863},
     zbl = {0559.35056},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1982__41_1-4_115507/}
}