@article{RMI_1997_1997_1_a10,
     author = {Ho, Alan},
     title = {Nota sobre autovalores de operadores diferenciales ordinarios.},
     journal = {Revista matem\'atica iberoamericana},
     pages = {403-410},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_1997_1997_1_a10/}
}