author= {Heigold, G. and Rybach, D. and Schl\\"uter, R. and Ney, H.},
title= {Investigations on Convex Optimization Using Log-Linear HMMs for Digit String Recognition},
booktitle= {Interspeech},
year= 2009,
pages= {216-219},
address= {Brighton, U.K.},
month= sep