@article{SMJ2_2002_28_1_a2,
     author = {Bartholdi, Laurent and Grigorchuk, Rostislav},
     title = {On {Parabolic} {Subgroups} and {Hecke} {Algebras} of some {Fractal} {Groups}},
     journal = {Serdica Mathematical Journal},
     pages = {47--90},
     year = {2002},
     volume = {28},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2002_28_1_a2/}
}