TY  - GEN
AU  - Stern, Elsbeth
TI  - What makes certain arithmetic word problems involving the comparison of sets so difficult for children
KW  - Psicologia e Educacao
KW  - 3500 - Psicologia Educacional
UR  - https://catalogo.ispa.pt/opac/biblioteca/localizacao_doc/r4.htm
ER  -