@article{AL_2000_39_4_a1,
     author = {V. G. Bardakov},
     title = {Computation of commutator length in free groups},
     journal = {Algebra i logika},
     pages = {395--440},
     year = {2000},
     volume = {39},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2000_39_4_a1/}
}