id	domain	url
issue-506	doi.org	https://doi.org/10.30525/2256-0742/2018-4-4-244-251
issue-506	uainfo.org	http://uainfo.org/blognews/1498207581-novyy-slozhnyy-mir.html
issue-506	www.un.org	http://www.un.org/news/press/docs/2001