@article{IM2_2000_64_4_a7,
     author = {A. M. Shur},
     title = {The structure of the set of cube-free $Z$-words in a~two-letter alphabet},
     journal = {Izvestiya. Mathematics},
     pages = {847--871},
     year = {2000},
     volume = {64},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2000_64_4_a7/}
}