@article{ZNSL_2002_289_a2,
     author = {N. A. Vavilov and V. A. Petrov},
     title = {Variations on a theme of {Higman}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {57--62},
     publisher = {mathdoc},
     volume = {289},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2002_289_a2/}
}