Creative problem solving.
Lenchner, George. 2005.
Creative problem solving. George Lenchner. - 2nd ed. - New York; Math Olympiad, 2005. - viii, 284 p. Includes index.
1882144104
Mathematics.
QA 63 .L46 2005
Creative problem solving. George Lenchner. - 2nd ed. - New York; Math Olympiad, 2005. - viii, 284 p. Includes index.
1882144104
Mathematics.
QA 63 .L46 2005