Geodesic
Correctness of the Cauchy problem in~Gevrey classes for nonstrictly hyperbolic operators
Sbornik. Mathematics, Tome 25 (1975) no. 3, pp. 365-387

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The Cauchy problem for any nonstrictly hyperbolic operator with analytic coefficients is correct in some Gevrey class if the domain is a lens of spatial type. Bibliography: 21 titles. 
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     author = {V. Ya. Ivrii},
     title = {Correctness of the {Cauchy} problem {in~Gevrey} classes for nonstrictly hyperbolic operators},
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     volume = {25},
     number = {3},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_25_3_a2/}
}
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V. Ya. Ivrii. Correctness of the Cauchy problem in~Gevrey classes for nonstrictly hyperbolic operators. Sbornik. Mathematics, Tome 25 (1975) no. 3, pp. 365-387. http://geodesic.mathdoc.fr/item/SM_1975_25_3_a2/