@article{PNA_2007_2007_1_a0,
     author = {Pardo, Tom\'as and  G\'omez, Bernardo},
     title = {La {Ense\~nanza} y el {Aprendizaje} de los {N\'umeros} {Complejos:} un {Estudio} en el {Nivel} {Universitario.}},
     journal = {PNA},
     pages = {3-15},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {2007},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/PNA_2007_2007_1_a0/}
}