id	domain	url
issue-304	dx.doi.org	http://dx.doi.org/10.30525/2256-0742/2017-3-5-334-342
issue-304	ec.europa.eu	http://ec.europa.eu/eurostat/web/agriculture/overview
issue-304	www.ukrstat.gov.ua	http://www.ukrstat.gov.ua/operativ/menu