Pietryka, I. 2010. The Efficiency of the Monetary Policy Instruments of the E E uropean Central Bank in Liquidity Regulating in the Euro Area. Equilibrium. Equilibrium. Quarterly Journal of Economics and Economic Policy. 5, 2 (Dec. 2010), 195–208. DOI:https://doi.org/10.12775/EQUIL.2010.035.