1. Alferov, Zh. I., and Kazarinov, R. F. (1963). Author's certificate No. 181737, Claim no. 950840 of March 30.
2. Investigation of the influence of the AlAs–GaAs heterostructure parameters on the laser threshold current and realization of continuous emission at room temperature;Alferov;Sov. Phys.—Semicond. (Engl. Transl.),1971
3. Bark, P., Boscher, G., Gier, J., Goldmann, H., and Zeidler, G. (1977). Installation of an experimental optical cable link and experiences obtained with the transmission of TV- and telephone signals. Conf. Proc. Eur. Conf. Opt. Cotnmun., 3rd, 1977 p. 243.
4. Basch, E. E., and Beaudette, R. A. (1977). The GTE fiber optic system. Nat. Telecommun. Conf. Rec, 1977 p. 14:2.
5. Selenium and the photophone;Bell;Electrician,1880