1. R. Zimmermann, Many-Particle Theory of Highly Excited Semiconductors (Teubner, Leipzig, 1988).
2. L. V. Keldysh, in: Bose-Einstein Condensation, edited by A. Griffin, D. W. Snoke, and S. Stringari (Cambridge University Press, 1995).
3. W. Ebeling, W. D. Kraeft, and D. Kremp, Theory of Bound States and Ionization Equilibrium in Plasmas and Solids (Akademie-Verlag, Berlin, 1976; Mir, Moscow, 1977).
4. Quantum statistics of an electron–hole plasma
5. Lifetime and level shift of bound states in plasmas