Kokotovic, Petar
Singular perturbation methods in control: analysis and design
Society for Industrial and Applied Mathematics, 1999
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Carroll, R.W.
Singular and degenerate cauchy problems
Academic Press, 1976
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Shishkin, Grigory I.
Difference methods for singular pertubation problems
CRC Press, Taylor & Francis Group, 2009
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Duffy, Dean G.
Mixed boundary value problems
Chapman & Hall/CRC , 2008
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Churchill, Ruel V., 1899-1987
Fourier series and boundary value problems
McGraw-Hill, 1978
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