Geodesic
Random walks on a flat lattice with traps
Teoretičeskaâ i matematičeskaâ fizika, Tome 10 (1972) no. 2, pp. 271-274 
G. V. Ryazanov. Random walks on a flat lattice with traps. Teoretičeskaâ i matematičeskaâ fizika, Tome 10 (1972) no. 2, pp. 271-274. http://geodesic.mathdoc.fr/item/TMF_1972_10_2_a12/
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     author = {G. V. Ryazanov},
     title = {Random walks on a flat lattice with traps},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {271--274},
     year = {1972},
     volume = {10},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1972_10_2_a12/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

An asymptotic expression (for large times) is obtained for the propagation function of a particle that wanders on a two-dimensional lattice with random traps . The density of traps is assumed low but perturbation theory cannot be applied because of the nonanalytic dependence of the absorption coefficient on the trap density.

[1] H. B. Rosenstoch, J. Math. Phys., 11 (1970), 487 | DOI