@misc{RCM_1978__12_252015,
     title = {[unknown]},
     journal = {Revista colombiana de matematicas},
     pages = {74--74},
     publisher = {mathdoc},
     volume = {12},
     year = {1978},
     url = {http://geodesic.mathdoc.fr/item/RCM_1978__12_252015/}
}