@article{DM_1992_4_2_a6,
     author = {Yu. L. Pavlov},
     title = {Some properties of plane trees with a~hanging root},
     journal = {Diskretnaya Matematika},
     pages = {61--65},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1992_4_2_a6/}
}