Published in Compte Rendu De L'academie Des Sciences Paris, in 1918, in volume 166, pages 79-82

Created: 2012-06-26, modified: 2012-06-26

Published in Compte Rendu de l'Academie des Sciences Paris, in 1918, in volume 166, pages 502-505

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