@Article{ GONZÁLEZ_RICO_Gallardo:309-340,

author = { JOSÉ LUIS GONZÁLEZ MARI and LUIS RICO ROMERO and Jesús Gallardo } ,

title = { Structural and semiotic diversity in the transition from the natural-number domain to the integres: a study of the understanding in the field of additive relativity },

journal = { Electronic Journal of Research in Educational Psychology },

volume = { 17 },

pages = { 309-340 },

}