@article{RCM_1980__14_181701,
     author = {Ra\'ul Tovar Sanchez},
     title = {Propiedades {De} {Tipo} {Espectral} {De} {Cierta} {Clase} {De} {Operadores} {Integrales.}},
     journal = {Revista colombiana de matematicas},
     pages = {209--232},
     publisher = {mathdoc},
     volume = {14},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/RCM_1980__14_181701/}
}