@article{ZNSL_2014_421_a6,
     author = {S. V. Duzhin and D. V. Pasechnik},
     title = {Groups acting on necklaces and sandpile groups},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {81--93},
     year = {2014},
     volume = {421},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2014_421_a6/}
}