Elnazarov AA. A criterion of exponential dichotomy for a countable system of differential equations with quasiperiodic coefficients. Ukr. Mat. Zhurn. [Internet]. 1997 Dec. 25 [cited 2025 Apr. 13];49(12):1717–1722. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5179