@Article{ MOLINA_Castro-Martinez_CASTRO:341-368,

author = { MARTA MOLINA and Encarnacion Castro-Martinez and ENRIQUE CASTRO MARTINEZ } ,

title = { ELEMENTARY STUDENTS¿ UNDERSTANDING OF THE EQUAL SIGN IN NUMBER SENTENCES },

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

year = { 2009 },

volume = { 17 },

pages = { 341-368 },

}