whois www.econa.org.ua/files/journals/1/articles/2304/submission/original/2304-6565658301-1-SM.html

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Try for webbased whois (don't expect it to work yet)

www.econa.org.ua/files/journals/1/articles/2304/submission/original/2304-6565658301-1-SM.html
checking....www.econa.org.ua/files/journals/1/articles/2304/submission/original/2304-6565658301-1-SM.html
   $ whois www.econa.org.ua/files/journals/1/articles/2304/submission/original/2304-6565658301-1-SM.html
No whois server is known for this kind of object.