@article{GAMA_1965_1965_1_a8,
     author = {Valle S\'anchez, Antonio},
     title = {Problemas de contorno el{\'\i}pticos.},
     journal = {Gaceta matem\'atica},
     pages = {121-133},
     publisher = {mathdoc},
     volume = {17},
     number = {5-6},
     year = {1965},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1965_1965_1_a8/}
}