X. Yin and D. M. Leitner, "Vibrational energy transfer and heat conduction in a protein", J. Phys. Chem. B 107, 1698 (2003); Michael D Fayer, "FAST PROTEIN DYNAMICS PROBED WITH INFRARED VIBRATIONAL ECHO EXPERIMENTS", Annu. Rev. Phys. Chem. 52, 315 (2001).