Geodesic
On an ODE Relevant for the General Theory of the Hyperbolic Cauchy Problem
Serdica Mathematical Journal, Tome 34 (2008) no. 1, pp. 311-328

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In this paper we study an ODE in the complex plane. This is a key step in the search of new necessary conditions for the well posedness of the Cauchy Problem for hyperbolic operators with double characteristics.
Keywords: Cauchy Problem, Zeroes of Entire Functions, Asymptotic Expansions, Hamilton Systems 
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Bernardi, Enrico; Bove, Antonio. On an ODE Relevant for the General Theory of the Hyperbolic Cauchy Problem. Serdica Mathematical Journal, Tome 34 (2008) no. 1, pp. 311-328. http://geodesic.mathdoc.fr/item/SMJ2_2008_34_1_a11/