DRĂGAN V, POPA I-L. A spectral criterion for the existence of the stabilizing solution of a class of Riccati type differential equations with periodic coefficients. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2021 Mar. 30 [cited 2025 Feb. 5];66(1):159-77. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1273