A continuous martingale in the plane that may spiral away to infinity
Séminaire de probabilités de Strasbourg, Tome 25 (1991), pp. 284-290. 
@article{SPS_1991__25__284_0,
     author = {Dubins, Lester E. and \'Emery, Michel and Yor, Marc},
     title = {A continuous martingale in the plane that may spiral away to infinity},
     journal = {S\'eminaire de probabilit\'es de Strasbourg},
     pages = {284--290},
     publisher = {Springer - Lecture Notes in Mathematics},
     volume = {25},
     year = {1991},
     mrnumber = {1187786},
     zbl = {0737.60036},
     language = {fr},
     url = {http://www.numdam.org/item/SPS_1991__25__284_0/}
}
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%A Émery, Michel
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Dubins, Lester E.; Émery, Michel; Yor, Marc. A continuous martingale in the plane that may spiral away to infinity. Séminaire de probabilités de Strasbourg, Tome 25 (1991), pp. 284-290. http://www.numdam.org/item/SPS_1991__25__284_0/

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[2] J. Azéma et M. Yor. En guise d'introduction. Temps locaux, Astérisque 52-53, Société Mathématique de France, 1978. | Numdam

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