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4. O. I. Bugaenko, L. S. Galkin and A. V. Morozhenko, Astron. Zh. 48, No. 2 (1972).
5. O. I. Bugaenko and A. L. Guralchuk, in A. Morozhenko (Ed.), “Photometric and Polarimetric Studies of Celestial Bodies,” p. 160 (Naukova Dumka, Kyiv, 1985).