Grebenyukov Vladimir Ivanovich (Cand. east. Sciences, Professor, Nizhnevartovsk State University)
Shulyak Timur Ilhamovich (Nizhnevartovsk State University)
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Grebenyukov Vladimir Ivanovich (Cand. east. Sciences, Professor, Nizhnevartovsk State University)
Shulyak Timur Ilhamovich (Nizhnevartovsk State University)
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