References



[1] E. A. Coddington and N. Levinson, Theory of Ordinary Differential Equations, McGraw-Hill, New York, 1955.

[2] M. S. P. Eastham, On a limit point method of Hartman, Bull. Lond. Math. Soc. 4 (1972), 340-344.

[3] D. B. Hinson, Limit point criteria for differential equations, Canad. J. Math. 24 (1972), 293-305.

[4] I. Knowles, Note on a limit point criterion, Proc. Amer. Math. Soc. 41 (1973), 117-119.

[5] S. L. Ross, Differential Equations, Blaisdell, Waltham, 1964.

[6] E. C. Titchmarsh, Eigenfunction Expansions, Part I, Second Edition, Clarendon, Oxford, 1962.