1. Alferov, Zh. I., M.V. Andreev, E.L. Portnoi and M.K. Trukan, 1970. “AlAs-GaAs Heterojunction Injection Lasers with a Low Room-Temperature Threhold.” Soy. Phys. Semiconductors 3, 1107–1110.
2. Barrow, W.L., 1936. “Transmission of Electromagnetic Waves in Hollow Tubes of Metal.” Proc. IRE 24, 1298–1328.
3. Basov, N.G., O.N. Krokhin and Yu.M. Popov, 1961. “Production of Negative Temperature States in P-N Junctions of Degenerate Semiconductors,” J.E. T.P. 40, 1320.
4. Carson, J.R., S.P. Mead and S.A. Schelkunoff, 1936. “Hyper-Frequency Wave Guides-Mathematical Theory.” Bell Sys. Tech. J. 15, 310–333.
5. Eriksrud, M. and A.R. Mickelson, 1982a. “Experimental Investigation of the Variation of Backscattered Power Level with Numerical Aperture in Multimode Optical Fibers.” Elect. Lett., 18, 130–132.