@Article{ GONZÁLEZ_Rico-Romero_GALLARDO:309-340,

author = { JOSÉ LUIS GONZÁLEZ MARI and Luis Rico-Romero and JESÚS GALLARDO ROMERO } ,

title = { STRUCTURAL AND SEMIOTIC DIVERSITY IN THE DIDACTIC TRANSITION FROM THE NATURAL-NUMBER DOMAIN TO THE INTEGERS: A STUDY OF UNDERSTANDING IN THE FIELD OF ADDITIVE RELATIVITY },

journal = { Revista Electrónica de Investigación Psicoeducativa y Psicopedagógica },

year = { 2009 },

volume = { 7 },

pages = { 309-340 },

}