Allahverdiev, B.P., H. Tuna, and H.A. Isayev. “Titchmarsh-Weyl Theory for Impulsive Hahn-Dirac Systems”. Carpathian Mathematical Publications 18, no. 1 (June 28, 2026): 278–288. Accessed July 14, 2026. https://journals.pnu.edu.ua/index.php/cmp/article/view/7207.