@misc{RCM_1967__1_252007,
     title = {[unknown]},
     journal = {Revista colombiana de matematicas},
     pages = {5--5},
     publisher = {mathdoc},
     volume = {1},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/RCM_1967__1_252007/}
}