A sharp inequality for sub-martingales and stopping-times
Colloque Paul Lévy sur les processus stochastiques (22-26 juin 1987. École Polytechnique, Palaiseau), Astérisque, no. 157-158 (1988), pp. 129-145. 
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     title = {A sharp inequality for sub-martingales and stopping-times},
     booktitle = {Colloque Paul L\'evy sur les processus stochastiques (22-26 juin 1987. \'Ecole Polytechnique, Palaiseau)},
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     number = {157-158},
     year = {1988},
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Dubins, Lester E.; Schwarz, Gideon. A sharp inequality for sub-martingales and stopping-times, dans Colloque Paul Lévy sur les processus stochastiques (22-26 juin 1987. École Polytechnique, Palaiseau), Astérisque, no. 157-158 (1988), pp. 129-145. http://www.numdam.org/item/AST_1988__157-158__129_0/

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