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   3. Hossein Hadian, Daniel Povey, Hossein Sameti, Sanjeev Khudanpur, Phone duration modeling for LVCSR using neural networks”
   4.  Tanel Alumae, “Neural Network Phone Duration Model for Speech Recognition”,
   5.  Dino Seppi, Daniele Falavigna, Georg Stemmer, Roberto Gretter, “Word Duration Modeling for Word Graph Rescoring in LVCSR