1. Nonlinear extensions of limit-point criteria;Atkinson;Math. Z.,1973
2. Stability Theory of Differential Equations;Bellman,1953
3. On the non-existence of L2-solutions of nonlinear differential equations;Burlak,1965
4. Limit circle results for second order equations;Burton;Monatsh. Math.,1976
5. Stability and Asymptotic Behavior of Differential Equations;Coppel,1965