by Tetyorkin, V.V., Alenberg, V.B., Sizov, F.F., Davidenko, S.N., Chopik, V.Yu
Published in Infrared physics (01.12.1993)

by Tetyorkin, V.V., Alenberg, V.B., Sizov, F.F., Susov, E.V., Troyan, Yu.G., Gusarov, A.V., Chopik, V.Yu, Medvedev, K.S.
Published in Infrared physics (1990)