1. P. I. Khadzhi, Nonlinear Optical Processes in the System of Excitons and Biexcitons in Semiconductors (Shtiintsa, Chisinau, 1985) [in Russian].
2. P. I. Khadzhi, G. D. Shibarshina, and A. Kh. Rotaru, Optic Bistability in the System of Excitons and Biexcitons in Semiconductors (Shtiintsa, Chisinau, 1988) [in Russian].
3. S. A. Moskalenko and D. W. Snoke, Bose–Einstein Condensation of Excitons and Biexcitons and Coherent Nonlinear Optics with Excitons (Cambridge Univ. Press, Cambridge, 2000).
4. Semiconductor Quantum Optoelectronics. From Quantum Physics to Smart Devices, Proceedings of the 50th Scottish Universities Summer School in Physics, St. Andrews, June, 1998, Ed. by A. Miller, M. Ebrahimzadeh, and D. M. Finlayson (Inst. Phys. Publ., Bristol, Philadelphia, 1998).
5. V. I. Rupasov and V. I. Yudson, Sov. J. Quantum Electron. 12, 1415 (1982).