Published in Comptes rendus hebdomadaires des séances de l'Académie des sciences, in 1921, in volume 172, pages 620-622

Created: 2013-02-24, modified: 2013-02-24

Published in Comptes rendus hebdomadaires des séances de l'Académie des sciences, in 1921, in volume 172, pages 1534-1536

Created: 2014-07-29, modified: 2014-07-29