no. 2
Spitzer's condition for random walks and Lévy processes
Annales de l'I.H.P. Probabilités et statistiques, Tome 33 (1997) no. 2, pp. 167-178 
@article{AIHPB_1997__33_2_167_0,
     author = {Bertoin, J. and Doney, R. A.},
     title = {Spitzer's condition for random walks and {L\'evy} processes},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {167--178},
     year = {1997},
     publisher = {Gauthier-Villars},
     volume = {33},
     number = {2},
     mrnumber = {1443955},
     zbl = {0880.60078},
     language = {en},
     url = {https://www.numdam.org/item/AIHPB_1997__33_2_167_0/}
}
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Bertoin, J.; Doney, R. A. Spitzer's condition for random walks and Lévy processes. Annales de l'I.H.P. Probabilités et statistiques, Tome 33 (1997) no. 2, pp. 167-178. https://www.numdam.org/item/AIHPB_1997__33_2_167_0/

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