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100 1 _aHahnemann, Siegfried
700 1 _aKallas, Peter
245 0 0 _aThe PDG's IMPACT Working groups
650 _aPatentdokumentation
_93575
650 _aPatentdokumentation
_93575
773 0 _aWPI. 19(1997),2,119-124
_wz_WPI
999 _c376
_d376