Geodesic
Solution of the operator equation $i\varepsilon dy/dt=A(t)y$ on intervals containing turning points
Teoretičeskaâ i matematičeskaâ fizika, Tome 122 (2000) no. 3, pp. 357-371 Cet article a éte moissonné depuis la source Math-Net.Ru

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We obtain formal solutions of the equation $i\varepsilon dy/dt=A(t)y$ in the form of complete asymptotic expansions as $\varepsilon\to0$ on intervals containing parabolic or hyperbolic turning points. The highest orders of the power series in $\varepsilon$ for the formal solutions are studied in detail. 
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     author = {E. A. Grinina},
     title = {Solution of the operator equation $i\varepsilon dy/dt=A(t)y$ on intervals containing turning points},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {357--371},
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     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2000_122_3_a3/}
}
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E. A. Grinina. Solution of the operator equation $i\varepsilon dy/dt=A(t)y$ on intervals containing turning points. Teoretičeskaâ i matematičeskaâ fizika, Tome 122 (2000) no. 3, pp. 357-371. http://geodesic.mathdoc.fr/item/TMF_2000_122_3_a3/

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