@article{AIHPB_2012__48_4_922_0,
     author = {Barlow, Martin T. and Peres, Yuval and Sousi, Perla},
     title = {Collisions of random walks},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {922--946},
     publisher = {Gauthier-Villars},
     volume = {48},
     number = {4},
     year = {2012},
     doi = {10.1214/12-AIHP481},
     mrnumber = {3052399},
     language = {en},
     url = {http://www.numdam.org/articles/10.1214/12-AIHP481/}
}