Published in Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, in 1901, in volume 1901, pages 65-69

Created: 2011-06-03, modified: 2011-06-21

Published in Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, in 1901, in volume 1901, pages 220-238

Created: 2012-09-14, modified: 2013-04-15