@Article{ Ayala_MOLINA:1271-1291,

author = { Cristina Alejandra Ayala Altamirano and MARTA MOLINA } ,

title = { Meanings attributed to letters in functional contexts by primary school students },

journal = { International Journal of Science and Mathematics Education },

year = { 2020 },

volume = { 18 },

pages = { 1271-1291 },

}