Literature cited
A. B. Vasil'eva and V. F. Butuzov, Asymptotic Expansions of the Solutions of Singularly Disturbed Equations [in Russian], Nauka, Moscow (1973), p. 272.
V. F. Butuzov and A. B. Vasil'eva, “Differential and difference equation systems with a small parameter for the case in which the undisturbed (singular) system is in the spectrum,” Differents. Uravn.,6, No. 4, 650–664 (1970).
V. F. Butuzov, “An integrodifferential equation with a small parameter multiplying the derivative in the case when the degenerate equation is in the spectrum,” Differents. Uravn.,7, No. 5, 919–922 (1971).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 29, No. 3, pp. 291–297, May–June, 1977.
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Vasil'eva, A.B., Khasanov, A.A. Some singularly disturbed systems in the critical case. Ukr Math J 29, 219–224 (1977). https://doi.org/10.1007/BF01104466
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DOI: https://doi.org/10.1007/BF01104466