 Complete the following phrase:  German Professor of History at Stuttgart University, Gerhard Hirschfeld, President of the International Committee for the History of the Second World War, in his obituary praised Madajczyk as an eminent historian, whose scholarly work on 20th Century Polish and European History has been widely acknowledged and respected and who, through his work, enhanced greatly the understanding of German occupation policies and different experiences of people under Fascist oppression. Hirschfeld referred to Madajczyks research on Generalplan Ost and German war plans and the Soviet massacre at 