scientific article published in January 2006

scholarly article in Bulletin of the American Astronomical Society, vol. 9, 1977

scientific article published in January 1979

scientific article published in January 1996

scientific article published in Astronomical Journal

scholarly article

scholarly article

scientific article published in January 1987

scientific article published in January 2004

scholarly article

scientific article published in January 1988

scholarly article

scientific article published in January 1993

scholarly article

scientific article published in January 1983

scientific article

scientific article published in November 1996

scientific article published in the Astrophysical Journal

scientific article published in the Astrophysical Journal

scientific article published in January 1998

scholarly article

scientific article published in the Astrophysical Journal

scientific article published in the Astrophysical Journal

scholarly article

scholarly article

scientific article published in January 2003