Geodesic
The multidimensional WKB method or the ray method. Its analogues and generalizations
Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya , Partial differential equations – 5, Tome 34 (1988), pp. 93-134.

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     author = {V. M. Babich},
     title = {The multidimensional {WKB} method or the ray method. {Its} analogues and generalizations},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya },
     pages = {93--134},
     publisher = {mathdoc},
     volume = {34},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTF_1988_34_a2/}
}
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V. M. Babich. The multidimensional WKB method or the ray method. Its analogues and generalizations. Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya , Partial differential equations – 5, Tome 34 (1988), pp. 93-134. http://geodesic.mathdoc.fr/item/INTF_1988_34_a2/