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Maslov, V.P., Shafarevich, A.I. On Asymptotic Solutions of Nonlinear Equations in the Presence of Turning Points. Differential Equations 40, 736–741 (2004). https://doi.org/10.1023/B:DIEQ.0000043532.67919.dc
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DOI: https://doi.org/10.1023/B:DIEQ.0000043532.67919.dc