Gawrońska, A., and S. Paszkowski. “THE DISTRIBUTION OF SOCIAL SECURITY PAYMENTS AMONG REGIONS OF POLAND – COMPARATIVE ANALYSIS”. Acta Scientiarum Polonorum. Oeconomia, Vol. 10, no. 1, Mar. 2011, pp. 5-19, https://js.wne.sggw.pl/index.php/aspe/article/view/3993.