Published in Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, in 1879, in volume 1879, pages 78-81

Published in Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, in 1879, in volume 1879, pages 105-111

Published in Sitzungsber. Ges. Naturf. Freunde Berlin, in 1879, in volume 1879, pages 149-150

Published in Sitzungsber. Ges. Naturf. Freunde Berlin, in 1879, in volume 1879, issue 2, pages 10-11

Published in Sitzungsber. Ges. Naturf. Freunde Berlin, in 1879, in volume 1879, issue 3, pages 35-37