Não informado. (1989). Celestial Mechanics & Dynamical Astronomy: An international journal of space dynamics. Kluwer Academic Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Celestial Mechanics & Dynamical Astronomy: An International Journal of Space Dynamics. Dordrecht, Holanda: Kluwer Academic Publishers, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Celestial Mechanics & Dynamical Astronomy: An International Journal of Space Dynamics. Kluwer Academic Publishers, 1989.
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