1. H.W. Jackson, J. Low Temp. Phys. 146, 329 (2007)
2. H.W. Jackson, Phys. Rev. B 19, 2556 (1979)
3. H.B. Callen, Thermodynamics (Wiley, New York, 1960). (See especially Chaps. 8 and 9, and Appendix G)
4. L. Tisza, in Phase Transformations in Solids, ed. by R. Smoluchoowsi, J.E. Mayer, W.A. Weyl (Wiley, New York, 1951), p. 1. (See especially pp. 11 and 12)
5. H.W. Jackson, e-print, http://arxiv.org/abs/cond-mat/0603082 (2006)