@article{10_4171_ggd_666,
     author = {Laurent Bartholdi and Thorsten Groth and Igor Lysenok},
     title = {Commutator width in the first {Grigorchuk} group},
     journal = {Groups, geometry, and dynamics},
     pages = {493--522},
     year = {2022},
     volume = {16},
     number = {2},
     doi = {10.4171/ggd/666},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/666/}
}