@article{RCM_2017_51_2_a4,
     author = {H\'ector Su\'arez and Oswaldo Lezama},
     title = { Armando {Reyes,}},
     journal = {Revista colombiana de matematicas},
     pages = {221--239},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {2017},
     url = {http://geodesic.mathdoc.fr/item/RCM_2017_51_2_a4/}
}