This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
GruppeExnerKreis. Kopie des Fotos von Mitgliedern des ExnerKreises anlsslich des Geburtstags von Viktor von Lang Vervielfltigung des Fotos von NoraRohdeExner PDold Physicists from Austria Felix Maria von ExnerEwarten Viktor von Lang Fritz Kohlrausch Marian Smoluchowski Friedrich Hasenhrl Anton Lampa Stefan Meyer Karl Przibram