References
A. B. Vasil'eva and V. F. Butuzov,Asymptotic Methods in the Theory of Singular Perturbations [in Russian], Vysshaya Shkola, Moscow (1990).
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Translated from Matematicheskie Zametki, Vol. 57, No. 3, pp. 338–349, March, 1995.
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Butuzov, V.F., Karashchjuk, A.F. One singularly perturbed system of partial differential equations of the first order. Math Notes 57, 240–247 (1995). https://doi.org/10.1007/BF02303968
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DOI: https://doi.org/10.1007/BF02303968