Actual problems of modern science: Abstracts of XLV International scientific-practical conference (Kharkiv – Vienna – Berlin – Astana, November 28, 2019)
Actual problems of modern science: Abstracts of XLV International scientific-practical conference (Kharkiv – Vienna – Berlin – Astana, November 28, 2019)
Actual problems of modern science: Abstracts of XLІІІ International scientific-practical conference (Kharkiv – Vienna – Berlin – Astana, August 29, 2019)
Actual problems of modern science: Abstracts of XLІІ International scientific-practical conference (Saint Petersburg - Astana - Kyiv - Vienna, June 27, 2019)