@article{Koeckelenbergh:41,
      author        = "Koeckelenbergh, A.",
      title         = "{Historical Session: the Contribution of Amateurs to
                       Astronomy, Yesterday and Today}",
      year          = "1988",
      note          = "Stargazers. The Contribution of Amateurs to Astronomy,
                       Proceedings of IAU Colloq. 98, 20-24 June, 1987. Edited by
                       Storm Dunlop and Michele Gerbaldi. Springer-Verlag Berlin
                       Heidelberg New York",
}