@inproceedings{BSK1:01,
   author    = {V.~Balakrishnan and Q.~Su and C-K.~Koh},
   title     = {Efficient Balance-and-Truncate Model Reduction for
	Large Scale Systems},
   booktitle = {Proc.\ American Control Conf.},
   year      = {2001},
   pages     = {4746-4751},
   month     = jun,
   address={Arlington, VA}
}