1. Invariant imbedding and the asymptotic behavior of solutions to initial value problems;Wing;J. Math. Anal. Appl.,1964
2. Stability Theory of Differential Equations;Bellman,1954
3. Eigenfunction Expansions Associated with Second-Order Differential Equations;Titchmarsh,1946
4. Problems in Quantum Mechanics;Goldman,1960
5. Tables of Functions;Jahnke,1943