참고문헌
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- Propagation and interaction of singularities in nonlinear hyperbolic problems M. Beals
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- Sem. Goulaouic-Meyer-Schwartz, exp. no.2 Interaction des singularites pour les equations aux derivees lpartielles non lineaires
- Introduction to the theory of linear partial differential equations J. Chazarain;A. Piriou
- Bulletin of AMS. v.15 no.2 Propagation of singularities of solutions to semilinear boundary value problems F. David;M. Willians
- Lectures on nonlinear hyperbolic differential equations L. Hormander
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- Hyperbokic boundary value problems R. Sakamoto
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- Basic linear partial differential equations F. Treves