MR0556576 Kumano-go, Hitoshi and Taniguchi, Kazuo Hitoshi KUMANO-GO and Kazuo TANIGUCHI Fourier integral operators of multiphase and the fundamental solution for a hyperbolic system Fako de l'Funkcialaj Ekvacioj Japana Matematika Societo. Funkcialaj Ekvaciog. Serio Internacia 22 1979 161--196 http://fe.math.kobe-u.ac.jp/FE/Free/vol22/fe22-2-3.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE21-30-en_KML/fe22-161-196/fe22-161-196.pdf http://www.ams.org/mathscinet-getitem?mr=MR0556576 fe22-161-196 1979 Fourier Integral Operators of Multi-Phase and the Fundamental Solution for a Hyperbolic System KUMANO-GO, Hitoshi; TANIGUCHI, Kazuo KUMANO-GO, Hitoshi; TANIGUCHI, Kazuo 1 Carathéodory, C. Calculus of variations and partial differential equations of the first order, Part I Holden-Day, Amsterdam 1965 xvi+171 MR0192372 95 Cache/Ca/Carathéodory,variations,*,1965,1966
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