共 3 条
[1]
Guggenheimer H., Geometric theory of differential equations III. Second Order Equations on the Reals, Arch. Rational Mech. Anal., 41, pp. 219-240, (1971)
[2]
Guggenheimer H., Stability Theory For Hill Equations with generalized Coeffizient, Proceedings of the American Mathematical Society, 53, pp. 155-158, (1975)
[3]
Ligeza J., On generalized solutions of linear differential equations of order n, Uniw. Slaski. Katowicach, Prace Mat., 3, pp. 101-108, (1973)