By Tkachuk V M   Kuzmak A R   in Journal of Physics A: Mathematical and Theoretical

ISSN:1751-8121|49|4|45301-45308

IOP Publishing‎(2016)‎

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By Gnatenko Kh. P.   Kargol A.   Tkachuk V. M.   in EPL (EUROPHYSICS LETTERS)

ISSN:0295-5075|120|3|30004-30004

Edp Sciences‎(2018)‎

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