MathSciNet bibliographic data MR1327046 (96h:34118) 34G10 (34E20 46L99 46N20) Spigler, Renato; Vianello, Marco WKB-type approximations for second-order differential equations in \$C\sp *\$$C\sp *$-algebras. Proc. Amer. Math. Soc. 124 (1996), no. 6, 1763–1771. Article

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