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CONTENTSIntroductionChapter I. Equations with constant coefficients § 1. Auxiliary statements § 2. Construction of fundamental solutions § 3. Asymptotic behaviour of fundamental solutions § 4. Conditions for existence and uniqueness of a solutionChapter II. Principle of limit absorption § 1. Generalized principle of limit absorption § 2. Sharpening of Theorem 2.2Chapter III. Equations with variable coefficients § 1. Conditions for existence and uniqueness of a solution § 2. An example § 3. A sufficient condition for § 4. Principle of limit absorption and generalized principle of limit absorption for equations with variable coefficientsChapter IV. Principle of limit amplitudeReferences
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B. Vaĭnberg (1966) studied this question.
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