00338nam a2200121Ia 4500003000400000008004100004040000800045100001400053245008900067250001000156260003500166300001500201LDD181029s9999    xx            000 0 und d  cLDD  aHusen, T. 4aThe International encyclopedia of educationbresearch and studies Vol 2bCcT. Husen  aed. I  aNewyorkbPeragamon Pressc1985  aix,623-128