Tanjung, I.U. and Arminsyah 2026. THE CONSTITUTIONAL PROBLEM OF PERPPU IN THE INDONESIAN LEGAL SYSTEM: TENSIONS BETWEEN EXECUTIVE AND LEGISLATIVE AUTHORITY FROM THE PERSPECTIVE OF CHECKS AND BALANCES. PENA LAW: International Journal of Law. 4, 1 (May 2026). DOI:https://doi.org/10.56107/penalaw.v4i1.308.