@incollection{Hardtwig2007,
  author    = {Wolfgang Hardtwig},
  title     = {Die Preußische Akademie der Wissenschaften in der Weimarer Republik},
  url       = {http://edoc.bbaw.de/oa/series/ren2T0S70UC2/PDF/26YS3HQHX2fM_342.pdf},
  year      = {2007},
}