1. Rudolf Clausius, The Nature of the Motion Which We Call Heat,’ Phil Mag. 14 (1857) 108.
2. Heinrich Hertz, The Principles of Mechanics Presented in a New Form (transl. by D. E. Jones and J. T. Walley), London 1899, Author’s Preface.
3. HW Watson, A Treatise on the Kinetic Theory of Gases, 2nd ed., Oxford 1893, p. 87.
4. Pierre Duhem, The Aim and Structure of Physical Theory (transl. by P. P. Wiener), Princeton 1954, pp. 55–104, especially pp. 71–72
5. R. Clausius, Uber verschiedene fur die Anwendung bequeme Formen der Haupt- gleichungen der mechanischen Warmetheorie’, Pogg. Ann. 125 (1865) 353