@article{DAN_1975_223_4_a7,
     author = {A. E. Petrov},
     title = {Some properties of sets of coordinates on original trees with numbered arcs},
     journal = {Doklady Akademii Nauk},
     pages = {803--805},
     year = {1975},
     volume = {223},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_223_4_a7/}
}