Symmetry, Integrability and Geometry: Methods and Applications, 2018, том 14 http://dspace.nbuv.gov.ua:80/handle/123456789/146043 Fri, 10 Apr 2026 09:38:05 GMT 2026-04-10T09:38:05Z Symmetry, Integrability and Geometry: Methods and Applications, 2018, том 14 http://dspace.nbuv.gov.ua:80/bitstream/id/435087/ http://dspace.nbuv.gov.ua:80/handle/123456789/146043