Kozak, S. “INTEGRATION WITH THE EUROPEAN FINANCIAL SYSTEM AND CHANGES OF THE NON-LIFE INSURANCE SECTOR CONCENTRATION IN POLAND”. Acta Scientiarum Polonorum. Oeconomia, Vol. 10, no. 2, June 2011, pp. 41-53, https://js.wne.sggw.pl/index.php/aspe/article/view/4009.