1. Bohr, N., “On the Constitution of Atoms and Molecules. Part II : Systems containing only a single nucleus”, Philosophical Magazine 26, 476–502, 1913.
2. La structure de la matière : rapports et discussions du Conseil de physique Solvay tenu à Bruxelles du 27 au 31 octobre 1913, Gauthier-Villars, Paris, 1921, p. 55.
3. Rutherford, E., “The Structure of the Atom”, Nature 92, 423, December 11, 1913.
4. Boltwood, B. B., “The origin of radium”, Nature 76, 544–545, September 26, and 589–589, October 10, 1907.
5. Merricks, L., The world made new : Frederick Soddy, science, politics, and environment, Oxford University Press, Oxford; New York, 1996.