1. E. BURSTEIN, A. HARSTEIN, J. SCHOENWALD, A. A. MARADUDIN and D. L. MILLS, Polaritons, edited by E. Burstein and F.deMartini (Pergamon Press, London, 1974), p. 89.
2. D. L. MILLS and K. R. SUBBASWAMY, Progress in Optics, vol. 19, edited by E. Wolf (North-Holland, Amsterdam, 1981), p. 45.
3. S. USHIODA, Progress in Optics, vol. 19, edited by E. Wolf (North-Holland, Amsterdam, 1981) p. 139.
4. V. M. AGRANOVICH, Surface Polaritons, edited by V. M. Agranovich and D. L. Mills (North-Holland, Amsterdam, 1982) p. 187.
5. F. ABELES and T. LOPEZ-RIOS, Surface Polaritons, edited by V. M. Agranovich and D. L. Mills (North-Holland, Amsterdam, 1982).