@article{PNA_2009_2009_1_a10,
     author = {G\'omez, Bernardo and  Contreras, Mauricio},
     title = {Sobre el {An\'alisis} de los {Problemas} {Multiplicativos} {Relacionados} con la {Divisi\'on} de {Fracciones.}},
     journal = {PNA},
     pages = {169-183},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {2009},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/PNA_2009_2009_1_a10/}
}