1. On the observation of 92Nb and 94Nb in nature;Apt;Geochim. Cosmochim. Acta,1974
2. Camp D.C. (1974) priv. communication to J.D. Knight.
3. Cosmology, Fusion and Other Matters;Fowler,1972
4. Observation of a long-lived isomeric state of 92Nb;Knight;Los Alamos Scientific Lab. report LA-DC-72-209,1972
5. Absolute difference between time of formation of planets and meteorites from extinct 92Nb radioactivity;Minster,1976