1. Special Issue on Far-infrared Semiconductor Lasers. Opt. Quantum Electron. 23 (1991) No. 2.
2. A. A.ANDRONOV, V. A.KOZLOV, L. S.MAZOV and V. N.SHASTIN, Pis'ma Zh. Eksp. Teor.Fiz. 30 (1979) 585. [JETP Lett. 30 (1979) 551.]
3. L. E.VOROBJEV, F. I.OSOKIN, V. I.STAFEEV and V. N.TULUPENKO, Pis'ma Zh. Eksp. Teor. Fiz. 34 (1981) 125. [JETP Lett. 34 (1981) 118.]
4. L. E.VOROBJEV, F. I.OSOKIN, V. I.STAFEEV and V. N.TULUPENKO, Pis'ma Zh. Eksp. Toer. Fiz. 35 (1982) 360. [JETP Lett. 34 (1982) 440.]
5. A. A.ANDRONOV, I. V.ZVEREV, V. A.KOZLOV, J. N.NOZDRIN and V. N.SHASTIN, Pis'ma Zh. Eksp. Teor. Fiz. 40 (1984) 69. [JETP Lett. 40 (1984) 804.]