Learning the Hidden Structure of Speech. Elman, J. & Zipser, D. Journal of the Acoustical Society of America, 83:1615--1626, 1988.
bibtex   
@article{ Elman_Zipser88,
  author = {Elman, J.L. and D. Zipser},
  title = {Learning the Hidden Structure of Speech},
  journal = {Journal of the Acoustical Society of America},
  year = {1988},
  volume = {83},
  pages = {1615--1626}
}

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