TY  - BOOK
AU  - Tran, Tu Nguyet
AU  - Nguyen,Thi Thu Nguyet
TI  - An introduction to the numerical operators in primary school
PY  - 1974///
CY  - Penang
PB  - SEOMEO
KW  - Mathematics
KW  - 1961-
KW  - Study and teaching (Primary)
KW  - Vietnam
ER  -