Published in Nytt Magazin for Naturvidenskapene, in 1913, in volume 51, pages 53-93

Created: 2017-10-18, modified: 2017-10-18

Published in Nyt Mag Naturv Kristiania, in 1913, in volume 51, pages 269-274

Created: 2012-12-06, modified: 2012-12-06