@Article{ RUIZ_LUPIÁÑEZ:397-424,

author = { ELENA FABIOLA RUIZ LEDESMA and JOSÉ LUIS LUPIÁÑEZ GÓMEZ } ,

title = { DETECTING PSYCHOLOGICAL OBSTACLES TO TEACHING AND LEARNING THE TOPICS OF RATIO AND PROPORTION IN SIXTH GRADE PRIMARY PUPILS },

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

year = { 2009 },

volume = { 17 },

issn = { 1696-2095 },

pages = { 397-424 },

doi = { http://www.investigacion-psicopedagogica.org/revista/new/english/index.php?n=17 },

}