author= {Raissi, Tina and Beck, Eugen and Schlüter, Ralf and Ney, Hermann},
title= { Improving Factored Hybrid HMM Acoustic Modeling without State Tying },
journal= {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)},
address= {Singapore},
note= {To Appear. Preprint arXiv:2201.09692 },
year= 2022