@article{mart:prop04,
  author	= {David B. Martens},
  title		= {Propositional Identity and Logical Necessity},
  journal	= {The Australasian Journal of Logic},
  year		= 2004,
  volume	= 1,
  pages		= {1-10},
  URL		= {http://www.philosophy.unimelb.edu.au/ajl/2004/},
}