@article{FPM_2007_13_6_a6,
     author = {B. Birch},
     title = {Shabat trees of diameter~4: {Appendix} to a~paper of {Zvonkin}},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {131--135},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2007_13_6_a6/}
}