1. Solozhenkin, P.M., Glazunova, E.M., Fedulov, V.P., and Giatsintova, K.V., USSR Inventor’s Certificate no. 390836, 1972.
2. Solozhenkin, P.M., Pulatov, G.Yu., Aknazarova, T.N., Sarkisov, O.E., Kondrat’eva, L.A., and Fedulov, V.P., USSR Inventor’s Certificate no. 532395, 1975.
3. Glembotskii, A.V., Bystrova, I.B., Glembotskii, O.V., Khamidov, B.V., Moiseenko, V.F., and Suslikov, B.F., USSR Inventor’s Certificate no. 405595, 1974.
4. Petukhov, V.N., Kyazimov, A.S., Khan, G.A., and Karaev, S.F., USSR Inventor’s Certificate no. 1077641, 1984.
5. Petukhov, V.N., Karaev, S.F., Kyazimov, A.S., and Salemgareeva, M.S., USSR Inventor’s Certificate no. 1077643, 1984.