@article{SM_1996_187_8_a1,
     author = {A. O. Ivanov and A. A. Tuzhilin},
     title = {The twist number of planar linear trees},
     journal = {Sbornik. Mathematics},
     pages = {1149--1195},
     publisher = {mathdoc},
     volume = {187},
     number = {8},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1996_187_8_a1/}
}