Published in Stuttgarter Beiträge Naturkunde, in 1957, in volume 2, pages 1-10

Created: 2017-08-18, modified: 2017-08-18

Published in Stuttgarter Beiträge Naturkunde, in 1957, in volume 3, pages 1-7

Created: 2017-08-18, modified: 2017-08-18