(2019)
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web address of the page https://jnas.nbuv.gov.ua/article/UJRN-0001093880
  Journal of mathematical physics, analysis, geometry      А - 2018  /     Issue (2019, Т. 15, Вип. 4)

Cite:
(2019). Journal of mathematical physics, analysis, geometry, 15 (4), 557-560 https://jnas.nbuv.gov.ua/article/UJRN-0001093880