1. Y.I. Bychkov, E.K. Karloav, N.V. Karlov, B.M. Koval’chuk, G.P. Kuz’min, Y.A. Kurbatov, V.T. Manykov, G.A. Mesyats, V.M. Orlovskii, A.M. Prokhorov, A.M. Rubalov, Pis’ma Zh. Tekh. Fiz. 2, 212 (1976) [Sov. Tech. Phys. Lett. 2, 81 (1976)]
2. V.A. Adamovich, V.Y. Baranov, R.K. Bevov, Y.B. Smakovskii, A.P. Strel’tsov, Pis’ma Zh. Tekh. Fiz. 4, 988 (1978) [Sov. Tech. Phys. Lett. 4, 398 (1978)]
3. C. Cason, G.J. Dezenberg, R.J. Huff, Appl. Phys. Lett. 23, 110 (1973)
4. A.M. Orishich, A.G. Ponomarenko, V.G. Posukh, R.I. Soloukhin, S.P. Shalamov, Pis’ma Zh. Tekh. Fiz. 3, 39 (1977)
5. Status Report on Laser Program ot LASL, Report LA-5251- PR, July-December (1972)