Ultra vires review of the ECB’s policy of quantitative easing: An analysis of the German Constitutional Court’s preliminary reference order in the PSPP case. - Common Market Law Review View Ultra vires review of the ECB’s policy of quantitative easing: An analysis of the German Constitutional Court’s preliminary reference order in the PSPP case. by - Common Market Law Review Ultra vires review of the ECB’s policy of quantitative easing: An analysis of the German Constitutional Court’s preliminary reference order in the PSPP case. 55 3 Common Market Law Review