Branching of Singularities for a Class of Hyperbolic Operators
Serge Alinhac
Indiana University Mathematics Journal
1978
text
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10.1512/iumj.1978.27.27071
10.1512/iumj.1978.27.27071
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Indiana Univ. Math. J. 27 (1978) 1027 - 1037
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