^Nikitin, B. A. Studies on the analytical chemistry of radium. II. Reactions of pure radium. Trav. inst. elat radium (U. S. S. R.), 1937. 3. pp 228-237. CAN31: 32676.
^Bedrich, Fridrich. Preparation of radium-beryllium neutron sources. Sb. Ref. Celostatni Radiochem. Konf., 3, Liblice, Czech., 1964. pp 135. CAN64: 90519.