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Butuzov, V.F., Kiryushin, V.V. A Step-Like Contrast Structure for the Case of a Multiple Root of the Transition Point Equation (the Critical Case). Differential Equations 37, 185–194 (2001). https://doi.org/10.1023/A:1019253323224
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DOI: https://doi.org/10.1023/A:1019253323224