@article{PNA_2006_2006_1_a2,
     author = {Ambrose, Rebecca and  Castro, Encarnaci\'on and  Molina, Marta},
     title = {Trabajo con {Igualdades} {Num\'ericas} para {Promover} {Pensamiento} {Relacional.}},
     journal = {PNA},
     pages = {33-46},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {2006},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/PNA_2006_2006_1_a2/}
}