Published in Compt. rend. Acad. Sci. Paris, in 1910, in volume 151, pages 26-32

Published in Compte Rendu De L'academie Des Sciences Paris, in 1910, in volume 151, pages 504-505

Published in Compte Rendu De L'academie Des Sciences Paris, in 1910, in volume 151, pages 991-993

Published in Compte Rendu De L'academie Des Sciences Paris, in 1910, in volume 151, pages 999-1001