1. P. Debye and E. Hückel, Phys. Zeit. 24 (1923) 305.
2. L. Onsager, J. Chem. Phys. 2 (1934) 599.
3. E. C. Potter, ?Electrochemistry? (Cleaver-Hume Press, 1961).
4. N. J. Felici, C. R. Acad. Sci., Paris 249 (1959) 1196.
5. G. P. Harnwell, ?Principles of Electricity and Magnetism? (McGraw-Hill, 1938).