Spiegel, Murray R.
Schaum?s outline of theory and problems of calculus of finite differences and difference equations
McGraw-Hil International, 1981
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Campbell, Stephen L.
An introduction to differential equations and their applications
Wadsworth, 1990
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Farlow, Stanley J.
An introduction to differential equations and their applications
McGraw-Hill, 1994
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Hsu, Sze-Bi
Ordinary differential equations with applications
World Scientific, 2013
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Spiegel, Murray R.
Schaum's outline of theory and problems of calculus of finite differences and difference equations
McGraw-Hill, 1971
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