ANDRICA D, CĂLUGĂREANU G. Uniquely clean 2 × 2 invertible integral matrices. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2017 Sep. 30 [cited 2025 Jul. 14];62(3):287–293. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1831