id	domain	url
csf-4201	www.history.com	https://www.history.com/topics/european-history/thirty-years-war
csf-4201	tyiekaugtr.wixsite.com	https://tyiekaugtr.wixsite.com/september-2018-vol-2/the-gregoriancalendar-part-1
csf-4201	doi.org	https://doi.org/10.2307/2087360
csf-4201	www.insightsonindia.com	https://www.insightsonindia.com/wpcontent/uploads/2020/02/leap_year_flowchart.png