MR2035450 Masahito OHTA Masahito OHTA Counterexample to Global Existence for Systems of Nonlinear Wave Equations with Different Propagation Speeds Funkcialaj Ekvacioj. Serio Internacia 46 2003 471--477 http://fe.math.kobe-u.ac.jp/FE/FullPapers/46-3/fe46-3-7.pdf http://www.ams.org/mathscinet-getitem?mr=MR2035450 46-471 2003 Counterexample to Global Existence for Systems of Nonlinear Wave Equations with Different Propagation Speeds Masahito OHTA Masahito OHTA
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