Published in Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, in 1893, in volume 1893, pages 152-157

Created: 2015-12-15, modified: 2015-12-15

Published in Sitzungsberichte Der Gesellschaft Naturforschender Zu Berlin, in 1893, in volume 1893, pages 225-228

Created: 2012-12-04, modified: 2012-12-04