@article{RCM_1971__5_181583,
     author = {Guillermo Restrepo},
     title = {Ecuaciones operacionales y ecuaciones diferenciales},
     journal = {Revista colombiana de matematicas},
     pages = {1--9},
     publisher = {mathdoc},
     volume = {5},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/RCM_1971__5_181583/}
}