@article{PNA_2009_2009_1_a11,
     author = {Fern\'andez, Catalina},
     title = {Modelizaci\'on de {Competencias} {Ordinales} en {Escolares} de 3 a 6 {A\~nos.}},
     journal = {PNA},
     pages = {185-212},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {2009},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/PNA_2009_2009_1_a11/}
}