1. Transition Temperatures of Superconductors
2. Empirical Relation between Superconductivity and the Number of Valence Electrons per Atom
3. Superconductivity;Shoenberg,1952
4. D. H. Bowen and G. O. Jones, Conf. Phys. Basses Temp., p. 514, Paris (1955).
5. For a complete list of references to pressure and isotope effects see Vol. I, Ch. VII, VIII and ref. 2.