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BibTeX Entry


@article{penn:00.4,
  author	= {Penn, Gerald},
  title		= {The Algebraic Structure of Transitive Closure and its Application to Attributed Type Signatures},
  journal	= {Grammars},
  volume	= {3},
  number	= {2-3},
  pages		= {295--312},
  year		= {2000},
  homepage	= {http://www.cs.toronto.edu/~gpenn/index.html},
}