@article{PNA_2008_2008_1_a5,
     author = {Molina, Marta and  Castro, Encarnaci\'on and  Mason, John},
     title = {Elementary {School} {Students{\textasciiacute}} {Approaches} to {Solving} {True/False} {Number} {Sentences.}},
     journal = {PNA},
     pages = {75-86},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PNA_2008_2008_1_a5/}
}