1. L'Element 87: AcK, Derive de l'Actinium;Perey;J. phys. radium,1939
2. Transmutation of Radium to Actinium (Ac227;Peterson;NNES,1949
3. Alpha Branching of Actinium 227;Peterson;NNES,1949
4. Half-Life of Th227;Peterson;NNES,1949
5. On the Half-Life of Actinium;Hollander;Phys. Rev.,1950