Published in Anales De La Sociedad Cientifica Argentina, in 1931, in volume 111, pages 147-156

Published in Anales Soc Cient Argentina, in 1931, in volume 111, issue 2, pages 93-96

Published in Anales de la Sociedad Cientifica Argentina, in 1931, in volume 112, pages 5-26

Published in Anales de la Sociedad Cientifica Argentina, in 1931, in volume 112, pages 129-142