@article{ZNSL_1984_137_a3,
     author = {A. N. Grigor'eva},
     title = {Linear-time recognition of tree-pictures isomorphism},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {80--86},
     publisher = {mathdoc},
     volume = {137},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_137_a3/}
}