1. I. M. Kogan, Chemistry of Synthetic Dyes (Otd. Nauchn.-Tekh. Izd., Glavnaya Redaktsiya Khim. Lit., Moscow, 1938) [in Russian].
2. I. M. Kogan, Chemistry of Dyes (Goskhimizdat, Moscow, 1956) [in Russian].
3. C. D. Nenitescu, Chimie organica (Ed. Tehnica, Bucuresti, 1960; Inostrannaya Literatura, Moscow, 1963).
4. Organic Semiconductors, Ed. by A. V. Topchiev (Akad. Nauk SSSR, Moscow, 1963) [in Russian].
5. A. N. Terenin, Photonics of Dye Molecules (Nauka, Leningrad, 1967) [in Russian].