@inproceedings(1991-learning-structural-models-of-subword-units-through-grammatical-inference-techniques,
  author = {Emilio Sanchis Arnal},
  title = {Learning Structural models of Subword Units through Grammatical Inference Techniques},
  year = {1991},
  booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)},
  address = {Toronto, Canada},
  pages = {189-192}
)