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  2. R. B. Melrose, G. A. Uhlmann, “Microlocal structure of involutive conical refraction”, Duke Math. J., 46:3 (1979)  crossref
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  4. Gunther A. Uhlmann, “Pseudo-differential operators with involutive double characteristics”, Communications in Partial Differential Equations, 2:7 (1977), 713  crossref
  5. Atsushi Yoshikawa, “Fundamental solutions to the Cauchy problem of some weakly hyperbolic equation”, Proc. Japan Acad. Ser. A Math. Sci., 53:4 (1977)  crossref
  6. V. Ya. Ivrii, “Correctness of the Cauchy problem in Gevrey classes for nonstrictly hyperbolic operators”, Math. USSR-Sb., 25:3 (1975), 365–387  mathnet  crossref  mathscinet  zmath
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