@article{Cullingford82,
  author	= {Cullingford, R. E. and Krueger, M. W. and Selfridge, M. and Bienkowski, M. A.},
  year		= {1982},
  title		= {Automated Construction of Classifications: Conceptual Clustering Versus Numerical Taxonomy},
  journal	= {IEEE Transactions on Systems, Man and Cybernetics},
  volume	= {12},
  number	= {2},
  pages		= {168--181}
}