Seminar of Celestial Mechanics and Space Research & Universitatea Babes-Bolyai. Sectia de Matematica. (1980). Seminar of celestial mechanics and space research: Preprint. Babes-Bolyai University, Faculty of Mathematics.
Chicago-referens (17:e uppl.)Seminar of Celestial Mechanics and Space Research och Universitatea Babes-Bolyai. Sectia de Matematica. Seminar of Celestial Mechanics and Space Research: Preprint. Cluj-Napoca: Babes-Bolyai University, Faculty of Mathematics, 1980.
MLA-referens (8:e uppl.)Seminar of Celestial Mechanics and Space Research och Universitatea Babes-Bolyai. Sectia de Matematica. Seminar of Celestial Mechanics and Space Research: Preprint. Babes-Bolyai University, Faculty of Mathematics, 1980.
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