00321nam a2200121Ia 4500003000400000008004100004040000800045100001900053245008100072250001200153260001900165300001500184LDD181029s9999    xx            000 0 und d  cLDD  aHusen, Torsten 4aThe International Encyclopeadia of Education Research studiescTorsten Husen  a1st ed.  bPergamonc1990  aSuppl. Vol