Waszkiewicz, Grzegorz. “The Efficiency of Sovereign Debt Markets in the EMU: Truth or Mistruth?”. Olsztyn Economic Journal 15, no. 1 (March 31, 2020): 23-38. Accessed December 2, 2020. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/5396.