TY  - GEN
AU  - Langford, Peter
TI  - Longitudinal study of children's understanding of logical laws in arithmetical and boolean algebre
KW  - Depósito de Retaguarda
KW  - 0220 - Depósito de Retaguarda
UR  - https://catalogo.ispa.pt/opac/biblioteca/localizacao_doc/dr.htm
ER  -