@article{AIHPB_1992__28_2_179_0,
     author = {Fayolle, G. and Malyshev, V. A. and Menshikov, M. V.},
     title = {Random walks in a quarter plane with zero drifts. {I.} {Ergodicity} and null recurrence},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {179--194},
     publisher = {Gauthier-Villars},
     volume = {28},
     number = {2},
     year = {1992},
     mrnumber = {1162572},
     zbl = {0747.60064},
     language = {en},
     url = {http://www.numdam.org/item/AIHPB_1992__28_2_179_0/}
}