@article{PORMA_1993__50_2_115816,
     author = {Cobos, Fernando and Resina, Ivam},
     title = {On {Hardy's} inequality and eigenvalue distributions},
     journal = {Portugaliae mathematica},
     pages = {151--156},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1993},
     mrnumber = {1244494},
     zbl = {0810.47044},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1993__50_2_115816/}
}