id	domain	url
dem-2900	www.dem.umk.pl	http://www.dem.umk.pl/dem
dem-2900	dx.doi.org	http://dx.doi.org/10.12775/dem.2013.006
dem-2900	stooq.pl	http://stooq.pl
dem-2900	fraclab.saclay.inria.fr	http://fraclab.saclay.inria.fr/)
dem-2900	dx.doi.org	http://dx.doi.org/10.1257/002205103765762743
dem-2900	dx.doi.org	http://dx.doi.org/10.1257/002205103765762743
dem-2900	dx.doi.org	http://dx.doi.org/10.1257/002205103765762743
dem-2900	www.aureamediocritas.pl	http://www.aureamediocritas.pl/30-lista-publikacji
dem-2900	dx.doi.org	http://dx.doi.org/10.1257/002205103765762743
dem-2900	www.dem.umk.pl	http://www.dem.umk.pl/dme/1997.htm
dem-2900	www.fuw.edu.pl	http://www.fuw.edu.pl/tl_files
dem-2900	xxx.lanl.gov	http://xxx.lanl.gov
dem-2900	dx.doi.org	http://dx.doi.org/10.1257/002205103765762743
dem-2900	dx.doi.org	http://dx.doi.org/10.1257/002205103765762743
dem-2900	dx.doi.org	http://dx.doi.org/10.1257/002205103765762743
dem-2900	www.dem.umk.pl	http://www.dem.umk.pl/dme/1997.htm