@inproceedings{EBFB:92,
   author    = {L. {El~Ghaoui} and V. Balakrishnan and E. Feron and S. Boyd},
   title     = {On Maximizing a Robustness Measure for Structured Nonlinear
       Perturbations},
   booktitle = {American Control Conf.},
   year      = {1992},
   month     = jun,
   address   = {Chicago},
   pages     = {2923-2924},
   volume    = 4 
}