Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya , Tome 32 (1988)

Geodesic

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Partial differential equations – 3

The Cauchy problem

L. R. Volevich ; S. G. Gindikin

p. 5-98

Qualitative theory of second order linear partial differential equations

V. A. Kondratiev ; E. M. Landis

p. 99-215