Second order differential equations with complex-valued coefficients
Czechoslovak Mathematical Journal (1972)
- Volume: 22, Issue: 4, page 590-599
- ISSN: 0011-4642
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top- Choy-Tak Taam, Oscillation Theorems, Amer. J. Math. LXXIV (1952), 317-324. (1952) MR0048669
- Barret J. H., Second order complex differential equations with a real independent variable, Рас. J. Math. VIII (1958), 187-200. (1958) MR0098213
- Hartman P., Ordinary differential equations, John Wiley Sons, Inc., New York-London- Sydney, 1964. (1964) Zbl0125.32102MR0171038