Piecuch, J. “THE EVOLUTION OF THE SOCIO-ECONOMIC SYSTEM OF SOUTHERN EUROPE DURING THE EUROPEAN UNION MEMBERSHIP OF GREECE, PORTUGAL AND SPAIN”. Acta Scientiarum Polonorum. Oeconomia, vol. 12, no. 3, Sept. 2013, pp. 73-82, https://aspe.sggw.edu.pl/article/view/531.