Published in Nytt Magazin For Naturvidenskaberne, in 1912, in volume 50, pages 15-22

Created: 2012-05-30, modified: 2012-05-30

Published in Nytt Magazin For Naturvidenskaberne, in 1912, in volume 50, pages 35-36

Created: 2012-05-30, modified: 2012-05-30