@proceedings{DBLP:conf/ecml/1989,
  editor    = {Katharina Morik},
  title     = {Proceedings of the 4th European Working Session on Learning,
               Montpellier, France, 4-6 December 1989},
  booktitle = {EWSL},
  publisher = {Pitman and Morgan Kaufman Publishers},
  year      = {1989},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}