@Article{ MOLINA_CASTRO_RUIZ:341-368,

author = { MARTA MOLINA and ENCARNACION CASTRO MARTINEZ and FRANCISCO RUIZ FERRON } ,

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

journal = { ||ELECTRONIC JOURNAL OF RESEARCH IN EDUCATIONAL PSYCHOLOGY|| },

year = { 2009 },

volume = { 17 },

issn = { 1696-2095 },

pages = { 341-368 },

}