Published in Bulletin De La Classe Des Science, Academie Royale De Belgique, in 1869, in volume 27, pages 645-680

Created: 2017-03-14, modified: 2017-03-14

Published in Bulletin De La Classe Des Science, Academie Royale De Belgique, in 1869, in volume 28, pages 168-208

Created: 2017-10-11, modified: 2017-10-11