1. P. Drude, Wied. Ann. 51, 77 (1894).
2. P. Drude, Lehrbuch der Optik (Hirzel, Leipzig, 1906; Leningrad-Moscow, ONTI, 1935).
3. D. V. Sivukhin, Zh. Éksp. Teor. Fiz. 30, 374 (1956) [Sov. Phys. JETP 3, 269 (1956)].
4. V. A. Kizel’, Reflection of Light (Nauka, Moscow, 1973).
5. O. N. Gadomskiĭ and A. V. Kadochkin, Opt. Spektrosk. 91, 798 (2001) [Opt. Spectrosc. 91, 749 (2001)].