scientific article published on 01 May 1969

scientific article published in January 1981

scientific article published in January 1980

scientific article published in January 1980

scientific article published in January 1979

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scientific article published in January 1978

scientific article published in January 1979

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scientific article

scholarly article published on Nov 01, 1988

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scientific article published in January 1980

scholarly article

scholarly article by Dolan J. F. et al published 1987 in Letters of the Astrophysical Journal

scholarly article

scientific article published in January 1979