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Walking a tightrope - looking back on risky position of German federal constitutional court in OMT preliminary questionHamulak, Ondrej; Kopal, David; Kerikmäe, TanelEuropean studies : the review of European law, economics and politics2016 / p. 115-141 http://caes.upol.cz/wp-content/uploads/2017/06/European-studies-volume-3-2016-FINAL-pdf.-e-book.pdf