no. 2
Random walks in a quarter plane with zero drifts. I. Ergodicity and null recurrence
Annales de l'I.H.P. Probabilités et statistiques, Tome 28 (1992) no. 2, pp. 179-194. 
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     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
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Fayolle, G.; Malyshev, V. A.; Menshikov, M. V. Random walks in a quarter plane with zero drifts. I. Ergodicity and null recurrence. Annales de l'I.H.P. Probabilités et statistiques, Tome 28 (1992) no. 2, pp. 179-194. http://archive.numdam.org/item/AIHPB_1992__28_2_179_0/

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