A.A. Maradudin, A.E. Fein, and G.H. Vineyard, Phys. Scr. 2 1479 (1962) Theory of LatticeDynamics in the Harmonic Approximation Vibrational Thermodynamics of Materials A.A. Maradudin and A.E. Fein, Phys. Rev. 128, 2589 (1962) http://www.its…