00270nam a2200109Ia 4500008004100000041001200041082001100053100001300064245007100077260000600148650000600154221030s9999    xx            000 0 und d  aEnglish  a105.23  aG. Polya 0aHow To Solve It - A New Aspect of Mathematical Methodcby G. Polya  c0  aB