Published in Compte Rendu, in 1889, in volume 108, pages 327-329

Published in Compte Rendu, in 1889, in volume 108, pages 1023-1025

Published in Compte Rendu, in 1889, in volume 108, pages 1178-1180

Published in Compte Rendu, in 1889, in volume 108, pages 1313-1314

Published in Compte Rendu, in 1889, in volume 109, pages 914-916

Published in Compte Rendu, in 1889, in volume 109, pages 982-983