@article{JSFU_2013_6_4_a11,
     author = {Vitaly A. Roman'kov},
     title = {The linearity problem for the unitriangular automorphism groups of free groups},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {516--520},
     year = {2013},
     volume = {6},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2013_6_4_a11/}
}