@article{PORMA_1977__36_3-4_115314,
     author = {Figueira, M\'ario and Haraux, Alain},
     title = {Th\'eor\`emes de surjectivit\'e pour une classe d'op\'erateurs dans les espaces de {Hilbert}},
     journal = {Portugaliae mathematica},
     pages = {191--195},
     publisher = {mathdoc},
     volume = {36},
     number = {3-4},
     year = {1977},
     mrnumber = {0597840},
     zbl = {0437.47037},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_3-4_115314/}
}