1. L. de Broglie,Non-Linear Wave Mechanics (Elsevier Publishing Company, Amsterdam, 1960), English edition.
2. H. Margenau,Phil. Sci. 4, 337 (1937).
3. A. Landé,New Foundations of Quantum Mechanics (Cambridge University Press, London, 1965).
4. E. T. Whittacker,Analytical Dynamics of Particles and Rigid Bodies (Cambridge University Press, London, 1965), 4th ed.
5. J. W. Gibbs,Elementary Principles in Statistical Mechanics (Yale University Press, New Haven, 1902; reprinted by Dover Publications, New York, 1960).