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Communicated by J. L. Lions
This work was partially supported by National Science Foundation Grant GP-35347 X.
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Friedman, A. Regularity theorems for variational inequalities in unbounded domains and applications to stopping time problems. Arch. Rational Mech. Anal. 52, 134–160 (1973). https://doi.org/10.1007/BF00282324
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DOI: https://doi.org/10.1007/BF00282324