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3. J.E. Rubio, Optimal control problems with unbounded control sets, Optimization, in press.
4. J.E. Rubio, The global control of shock waves, in: M. Oberguggenberger (Ed.), Proceedings of a Conference on Nonlinear Theory of Generalized Functions, Vienna, 1997, Research Notes in Mathematics, 401, Chapman & Hall, London, 1999.
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