He studied under Prof. von Hippel , who became a personal friend .
Towards the end of World War II , Tomberg received a Ph. D. in Jurisprudence from the University of Cologne , where he had moved in 1944 .
Tomberg studied under Prof. von Hippel , who became a personal friend .
Towards the end of World War II , Tomberg received a Ph. D. in Jurisprudence from the University of Cologne , where he had moved in 1944 .