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An inequality for the reduced wave operator and the justification of geometrical optics. (English) Zbl 0157.18701

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[1] Buslaev, Akad. Nauk SSSR Trudy Mat. Inst. Steklov 73 pp 14– (1964)
[2] Grimshaw, Comm. Pure Appl. Math. 19 pp 167– (1966)
[3] Hartman, Math. Z. 75 pp 228– (1961)
[4] Keller, J. Opt. Soc. Amer. 52 pp 116– (1962)
[5] Keller, Comm. Pure Appl. Math. 9 pp 207– (1956)
[6] and , Electromagnetic Theory and Geometrical Optics, Interscience Publishers, New York, 1965. · Zbl 0123.23602
[7] Ludwig, Comm. Pure Appl. Math. 20 pp 103– (1967)
[8] Morawetz, Comm. Pure Appl. Math. 15 pp 349– (1962)
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