@article{VTPMK_2017_4_a5,
     author = {I. A. Drozhzhin},
     title = {An analog of {Markov's} theorem},
     journal = {Vestnik Tverskogo gosudarstvennogo universiteta. Seri\^a Prikladna\^a matematika},
     pages = {73--83},
     publisher = {mathdoc},
     number = {4},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTPMK_2017_4_a5/}
}