Piecuch, Jakub. 2013. “THE EVOLUTION OF THE SOCIO-ECONOMIC SYSTEM OF SOUTHERN EUROPE DURING THE EUROPEAN UNION MEMBERSHIP OF GREECE, PORTUGAL AND SPAIN”. Acta Scientiarum Polonorum. Oeconomia 12 (3), 73-82. https://js.wne.sggw.pl/index.php/aspe/article/view/4089.