Elsgolts, L.
Differential equations and the calculus of variations / L. Elsgolts
MIR Publishers, 1970
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Lefschetz, Solomon
Differential equations : geometric theory / Solomon Lefschetz
Dover , 1977
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Boyce, W.E., author
Solution manual to accompany elementary differential equations and boundary value problems
John Wiley and Sons, 1976
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Brauer, Fred
Problems and solutions in ordinary differential equations / Fred Brauer, John A. nohel
W.A. Benjamin, 1968
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Gear, C. William (Charles William), 1935-, author
Numerical initial value problems in ordinary differential equations / C. William Gear
Prentice-Hall, 1971
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