@InProceedings{RYert98,
  author = 	 {Eric Sven Ristad and Peter N. Yianilos},
  title = 	 {Towards EM-style Algorithms for {\em a posteriori}
			Optimization of Normal Mixtures},
  booktitle = 	 {Proc. IEEE Symposium on Information Theory},
  year =	 1998,
  month =	 {August}
}

@TechReport{RYert96,
  author = 	 {Eric Sven Ristad and Peter N. Yianilos},
  title = 	 {On the Strange {\em a Posteriori} degeneracy of
		  Normal Mixtures, and Related Reparameterization Theorems},
  institution =  {Princeton University},
  year = 	 1996,
  number =	 {CS-TR-541-96},
  address =	 {Department of Computer Science}
}