no. 2
Changing time for two-parameter strong martingales
Annales de l'institut Henri Poincaré. Section B. Calcul des probabilités et statistiques, Tome 17 (1981) no. 2, pp. 147-163 
@article{AIHPB_1981__17_2_147_0,
     author = {Nualart, D. and Sanz, M.},
     title = {Changing time for two-parameter strong martingales},
     journal = {Annales de l'institut Henri Poincar\'e. Section B. Calcul des probabilit\'es et statistiques},
     pages = {147--163},
     year = {1981},
     publisher = {Gauthier-Villars},
     volume = {17},
     number = {2},
     mrnumber = {625336},
     zbl = {0463.60040},
     language = {en},
     url = {https://www.numdam.org/item/AIHPB_1981__17_2_147_0/}
}
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Nualart, D.; Sanz, M. Changing time for two-parameter strong martingales. Annales de l'institut Henri Poincaré. Section B. Calcul des probabilités et statistiques, Tome 17 (1981) no. 2, pp. 147-163. https://www.numdam.org/item/AIHPB_1981__17_2_147_0/

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