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scientific article published on March 1, 1975

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

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scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

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scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

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scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

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scientific article published in Astronomy and Astrophysics

scientific article published in Astronomy and Astrophysics

scientific article published in July 2010