id	domain	url
dem-2904	www.dem.umk.pl	http://www.dem.umk.pl/dem
dem-2904	dx.doi.org	http://dx.doi.org/10.12775/dem.2013.010
dem-2904	www.eia.gov	www.eia.gov
dem-2904	www.stats.oecd.org	www.stats.oecd.org)
dem-2904	www.nber.org	http://www.nber.org/-cycles/cyclesmain.html
dem-2904	dx.doi.org	http://dx.doi.org/10.1093/oep/56.1.1
dem-2904	dx.doi.org	http://dx.doi.org/10.1016/s0022-1996(98)00064-6
dem-2904	dx.doi.org	http://dx.doi.org/10.1111/j.1467-9485.2009.00482.x
dem-2904	dx.doi.org	http://dx.doi.org/10.1016/s1062-9769(02)00138-2
dem-2904	dx.doi.org	http://dx.doi.org/10.2307/2297185
dem-2904	dx.doi.org	http://dx.doi.org/10.1016/j.econmod.2011.10.006
dem-2904	dx.doi.org	http://dx.doi.org/10.1016/s0304-3932(01)00086-1
dem-2904	utip.gov.utexas.edu	http://utip.gov.utexas.edu/papers/utip_27.pdf
dem-2904	dx.doi.org	http://dx.doi.org/10.1016/0167-2231(88)90031-0
dem-2904	dx.doi.org	http://dx.doi.org/10.2307/1912559
dem-2904	dx.doi.org	http://dx.doi.org/10.1016/s0304-3932(96)01282-2
dem-2904	dx.doi.org	http://dx.doi.org/10.1353/mcb.2002.0041
dem-2904	omrpublic.iea.org	http://omrpublic.iea.org/currentissues/full.pdf
dem-2904	dx.doi.org	http://dx.doi.org/10.1016/0304-3932(92)90011-p
dem-2904	dx.doi.org	http://dx.doi.org/10.1007/s10108-004-0088-0
dem-2904	dx.doi.org	http://dx.doi.org/10.2139/ssrn.509262
dem-2904	dx.doi.org	http://dx.doi.org/10.1016/s0304-3932(02)00114-9
dem-2904	dx.doi.org	http://dx.doi.org/10.2307/1926035
dem-2904	www.nber.org	http://www.nber.org/cycles/cyclesmain.html