@article{PNA_2009_2009_1_a4,
     author = {A. Malara, Nicolina and  Navarra, Giancarlo},
     title = {Approaching the {Distributive} {Law} with {Young} {Pupils.}},
     journal = {PNA},
     pages = {73-85},
     year = {2009},
     volume = {3},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PNA_2009_2009_1_a4/}
}