TY JOUR TI CONSTITUTIONAL REFORM IN THE XXI CENTURY: DEVELOPMENT AND TRANSFORMATION OF LEGAL PRINCIPLES OF TAXATION KW principles KW tax KW equality KW fairness KW certainty KW constitutional reform KW constitutionalisation of tax law KW constitutional design KW legal system KW constitutions of XXI century. JO Journal of Foreign Legislation and Comparative Law AU Zhuravleva, O.. PY 2017 IS 3 PB Legal publishing house Norm