@article{PORMA_1981__40_4_115476,
     author = {Massabo, I.},
     title = {Unbounded components of solutions for equations of {Birkhoff-Kellogg} type},
     journal = {Portugaliae mathematica},
     pages = {463--467},
     publisher = {mathdoc},
     volume = {40},
     number = {4},
     year = {1981},
     mrnumber = {0836110},
     zbl = {0588.47071},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_4_115476/}
}