1. D. Pines, Elementary Excitations in Solids (W.A. Benjamin, Inc., New York, 1963)
2. S.I. Pekar, Crystaloptics and Addition Waves (Kiev, Naukova Dumka, 1982) (in Russian)
3. G.P. Srivastava, The Physics of Phonons (Hilger, Bristol, 1990)
4. V.G. Plekhanov, Isotopetronics-New Directions of Nanoscience, ArXiv, phys./1007.5386
5. V.G. Plekhanov, Isotopic and disorder effects in large exciton spectroscopy. Physcs–Uspekhi (Moscow) 40, 553–579 (1997)