Absolut brightness of comet Ikya-Seki 1965 f and of other comets of Kreutz's group Jiří Bouška (1966) Acta Universitatis Carolinae. Mathematica et Physica Similarity:
Form and enlargement of the Earth's shadow during the lunar eclipses of August 26, 1961, July 6, 1963 and June 24-25, 1964 Zdeněk Sekanina (1965) Acta Universitatis Carolinae. Mathematica et Physica Similarity:
Observations of comets and asteroids at the Kleť Observatory in the year 1972 A. Mrkos (1972) Acta Universitatis Carolinae. Mathematica et Physica Similarity: