@inproceedings{BBB:91,	
        author={Balemi, S. and V. Balakrishnan and S. Boyd},
        title={{Computation of the Maximum ${\bf H}_\infty$-norm of 
        Parameter-dependent Linear Systems by a Branch and Bound Algorithm}},
        year={1991},
	booktitle={Proc. of MNTS-91}
        }
@inproceedings{KhPa:86,	
        author={Khargonekar, P.I. and A.M. Pascoal},
        title={Robust stabilixability of {LTI} plants: {NLTV}
        controllers},
        year={1986},
	booktitle={Proc. 25th IEEE CDC},
       	address={Athens, Greece}
        }