Published in Arkiv For Zoologi, in 1903, in volume 1, pages 157-169
Published in Arkiv For Zoologi, in 1903, in volume 1, pages 223-234
Published in Arkiv för Zoologi, in 1903, in volume 1, pages 329-381
Published in Arkiv For Zoologi, in 1903, in volume 1, issue 8, pages 181-196