Published in Bulletin de l'Académie impériale des sciences de St.-Pétersbourg, in 1909, in volume 3, pages 69-74

Created: 2014-04-25, modified: 2014-04-25

Published in Bulletin de l'Académie impériale des sciences de St.-Pétersbourg, in 1909, in volume 3, issue 12, pages 887-902

Created: 2014-04-25, modified: 2014-04-25