id	domain	url
dem-5675	www.dem.umk.pl	http://www.dem.umk.pl/dem
dem-5675	dx.doi.org	http://dx.doi.org/10.12775/dem.2014.005
dem-5675	stooq.pl	http://stooq.pl
dem-5675	research.economics.unsw.edu.au	http://research.economics.unsw.edu.au/vpanchenko/software/2006_gc_jed
dem-5675	dx.doi.org	http://dx.doi.org/10.1016/j.jedc.2005.08.008
dem-5675	dx.doi.org	http://dx.doi.org/10.2307/2329266