TY  - BOOK
T1  - Contest problems of world sudoku championships
A2  - Chua, Simon L.
LA  - English
PP  - Pasig City
PB  - Anvil Pub.
YR  - 2009
UL  - https://tuklas.up.edu.ph/Record/UP-99796217609624735
OP  - 70
CN  - GV 1507 S83 C66 2009
SN  - 9789712722424 (pbk.)
KW  - Sudoku : Philippines.
KW  - Mathematical recreations : Philippines.
KW  - Puzzles.
ER  -