1. Trav. Inst. Etat. Radium;Bobin,1933
2. Radioactivity in some oil fields of southeastern Kansas;Gott;U.S. Geol. Surv. Bul.,1953
3. Trav. Inst. Etat. Radium;Komlev,1933
4. On the isotopic constitution of radium (Ra-223/Ra-226) in uranium minerals, and recent problems of geochronology;Kuroda;An. New York Acad. Sci.,1955
5. On the activity ratio of the actinium series to the uranium series radioactive element;Kuroda,1955