Boyce, William E.
Elementary differential equations
John Wiley & Sons, 1992
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Boyce, William E.
Elementary differential equations
John Wiley & Sons, 1977
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Trench, William F.
Elementary differential equations
Grove Brooks/Cole, 2000
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Bellman, Richard
Modern elementary differential equations / Richard Bellman
Addison-Wesley, 1968
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Boyce, W.E.
Solution manual to accompany elementary differential equations and boundary value problems
John Wiley & Sons, 1976
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