by Belikovich, V. V., Benediktov, E. A., Berezin, I. V., Dobrushskii, L. A., Razin, V. A., Teplykh, A. I., Tolmacheva, A. V., Tomchinskii, A. M., Shavin, P. B.
Published in Radiophysics and quantum electronics (01.03.1979)