Published in Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, in 1918, in volume 1918, pages 61-66

Created: 2013-04-04, modified: 2013-04-04

Published in Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, in 1918, in volume 1918, issue 9, pages 327-345

Created: 2013-03-01, modified: 2013-03-01