Published in Compte Rendu, in 1887, in volume 104, pages 80-83

Published in Compte Rendu, in 1887, in volume 104, pages 185-187

Published in Compte Rendu, in 1887, in volume 104, pages 921-923

Published in Compte Rendu, in 1887, in volume 104, pages 1309-1311

Published in Compte Rendu, in 1887, in volume 105, pages 872-874

Published in Comptes Rendus Hebdomadaires des Seances de I'Academie des Sciences, in 1887, in volume 105, pages 1033-1035