Published in Comptes rendus hebdomadaires des séances de l'Académie des sciences, in 1903, in volume 137, pages 346-348

Published in Cr Ac Sci, in 1903, in volume 137, pages 418-419

Published in Comptes rendus hebdomadaires des séances de l'Académie des sciences, in 1903, in volume 137, pages 1002-1003

Published in Cr Ac Sci, in 1903, in volume 137, pages 1003-1006