@ARTICLE{_Mastering_2014, number={No 4}, journal={Nauka}, howpublished={online}, year={2014}, publisher={Biuro Upowszechniania i Promocji Nauki PAN}, title={Mastering Demographic Change in Europe– 8 European Academies’ Statement}, URL={http://www.journals.pan.pl/Content/92263/mainfile.pdf}, }