@article{CMA_2013_88_a7,
     author = {N. L. Poliakov},
     title = {On the algorithmic decidability of the square-free word problem relative to a system of two defining relations},
     journal = {Contemporary Mathematics and Its Applications},
     pages = {84--90},
     year = {2013},
     volume = {88},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMA_2013_88_a7/}
}