Geodesic
Subgroups of the braid group $B_4$
Matematičeskie zametki, Tome 50 (1991) no. 6, pp. 3-13 
A. M. Akimenkov. Subgroups of the braid group $B_4$. Matematičeskie zametki, Tome 50 (1991) no. 6, pp. 3-13. http://geodesic.mathdoc.fr/item/MZM_1991_50_6_a0/
@article{MZM_1991_50_6_a0,
     author = {A. M. Akimenkov},
     title = {Subgroups of the braid group $B_4$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {3--13},
     year = {1991},
     volume = {50},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_6_a0/}
}
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