Cronin, Jane
Differential equations: introduction and qualitative theory
"New York: Marcel Dekker, 1994",
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Muller-Pfeiffer, Erich
Spectral theory of ordinary differentials operators
Ellis Horwood, 1981
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Ross, Shepley L.
Introduction to ordinary differential equations
John Wiley & Sons, 1980
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Coddington, Earl A.
An introduction to ordinary differential equations / Earl A. Coddington
Dover, 1989
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Manougian, Manoug N.
Ordinary differential equations: an introduction / Manoug N. Manougian, Robert A. Northcutt
Charles E Merril, 1973
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