@article{RCM_2015_49_2_a2,
     author = {L. Roc{\'\i}o Gonz\'alez-Ram{\'\i}rez and Osvaldo Osuna},
     title = { Rub\'en {Santaella-Forero}},
     journal = {Revista colombiana de matematicas},
     pages = {261--268},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {2015},
     url = {http://geodesic.mathdoc.fr/item/RCM_2015_49_2_a2/}
}