@article{RCM_1977__11_181663,
     author = {Yu Takeeuchi},
     title = {Espacio con la metrica operador},
     journal = {Revista colombiana de matematicas},
     pages = {77--108},
     publisher = {mathdoc},
     volume = {11},
     year = {1977},
     url = {http://geodesic.mathdoc.fr/item/RCM_1977__11_181663/}
}