Christian Gerthsen
Christian Gerthsen ( 21 November 1894 in Hörup , Alsen , Denmark – 8 December 1956 in Karlsruhe , West Germany ) was a Danish-German physicist who made contributions to atomic and nuclear physics , as well as writing numerous textbooks . 
<triplet> Christian Gerthsen <subj> 21 November 1894 <obj> date of birth <subj> Denmark <obj> place of birth <subj> 8 December 1956 <obj> date of death <triplet> Alsen <subj> Denmark <obj> country