00340nam a2200121Ia 4500003000400000008004100004040000800045100001400053245009100067250001000158260003500168300001500203LDD181029s9999    xx            000 0 und d  cLDD  aHusen, T. 4aThe International encyclopedia of educationbresearch and studies Vol 6bM-OcT. Husen  aed. I  aNewyorkbPeragamon Pressc1985  aix,3157-37