@article{Kaplan-etal93,
  author	= {Kaplan, C. and Fenwick, J. and Chen, J.},
  title		= {Adaptive Hypertext Navigation Based on User's Goals and Context},
  journal	= {User Modeling and User-Adapted Interaction},
  year		= {1993},
  volume	= {3},
  number	= {3},
  pages		= {193--220}
}