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Dr. B. K. Ioannisiani was unable to give his scheduled paper on this subject, but Dr. N. N. Mihel’son kindly agreed to answer questions in its place.
Ioannisiani, B. K., 1970. The Development of the 6-metre Reflecting Telescope, Optiko-Mehaniceskaja Promyšlennosf, 37, 37.Google Scholar
Besekerskij, V. A. and Neplohov, E. M., 1970. Use of the principle of invariance in the control system of an optical altazimuth telescope, in The Theory of Invariance in Automatic Systems, Moscow, p. 319, 1970.Google Scholar