@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 },
}