1. Sur la Vie Moyenne de l'Ionium;Curie;Compt. Rend.,1930
2. The Relation between Uranium and Radium. - Part IX. The period of Ionium;Soddy;Phil. Mag. and J. Sci.,1931
3. A New Radioactive Series – The Protactinium Series;Studier;Phys. Rev.,1948
4. Determination of the Half Life of Ionium;Hyde,1949
5. Products of the Deuteron and Helium-Ion Bombardments of Pa231;Osborne,1949