@INPROCEEDINGS {1575,
author={J. J. Júdice and J.  Patrício and L. M. Fernandes and I. Figueiredo},
doi={},
booktitle={International Symp. on Mathematical Programming},
title={An investigation of a nonlinear obstacle plate optimization problem },
year={2003},
month={August},
volume={1},
pages={1-1} 
}