00355nam a2200109Ia 4500008004100000020001800041082001500059100002100074245010700095260003500202300000800237190710s9999    xx            000 0 und d  a0-7619-7513-6  a510.712 P8  aPosamentier, A S 0a101 great ideas for introducing key concepts in mathematics : a resource for secondary school teachers  aCaliforniabCorwin Pressc2001  a225