[1]
L. L. Oridoroga, M. M. Malamud, and A. V. Agibalova, “On the completeness of general boundary value problems for $2 \times 2$ first-order systems of ordinary differential equations”, MFAT, vol. 18, no. 1, pp. 4–18, Mar. 2012, Accessed: Feb. 04, 2026. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/502