Actual problems of modern science: Abstracts of XXХІХ International scientific-practical conference (Saint Petersburg – Astana – Kyiv – Vienna, February 27, 2019)
Actual problems of modern science: Abstracts of XXХІІІ International scientific-practical conference (Moscow - Astana - Kharkiv - Vienna, August 30, 2018)
Actual problems of modern science: Abstracts of XXХІІІ International scientific-practical conference (Moscow - Astana - Kharkiv - Vienna, August 30, 2018)
