ANDRICA, Dorin, and Grigore CĂLUGĂREANU. “Uniquely Clean 2 × 2 Invertible Integral Matrices”. Studia Universitatis Babeș-Bolyai Mathematica 62, no. 3 (September 30, 2017): 287–293. Accessed July 14, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1831.