Não informado. (1968). Astrophysics and Space Science: An international journal of cosmic physics. D. Reidel Publishing.
Chicago-viite (17. p.)Não informado. Astrophysics and Space Science: An International Journal of Cosmic Physics. Dordrecht, Holanda: D. Reidel Publishing, 1968.
MLA-viite (8. p.)Não informado. Astrophysics and Space Science: An International Journal of Cosmic Physics. D. Reidel Publishing, 1968.
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