1. Electron-Hole Condensation in Semiconductors
2. Physics of Highly Excited States in Solids, Lecture Notes in Physics 57 (Springer, Berlin, 1976).
3. Optical properties of highly excited direct gap semiconductors
4. L.V. Keldysh, in: Proc. 9th Int. Conf. Physics of Semiconductors, Moscow, 1968, eds., S.M. Ryvkin and Yu. V. Shmartsev (Nauka, Leningrad, 1968) p. 1303.