@article{RCM_1968__2_181564,
     author = {Francisco Lleras},
     title = {Series para e de gran convergenica},
     journal = {Revista colombiana de matematicas},
     pages = {144--148},
     year = {1968},
     volume = {2},
     url = {http://geodesic.mathdoc.fr/item/RCM_1968__2_181564/}
}