Geodesic
The calculation of “non-geometrical” wave $S^*$ by using of complex rays
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 24, Tome 200 (1992), pp. 17-26 
V. M. Babich. The calculation of “non-geometrical” wave $S^*$ by using of complex rays. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 24, Tome 200 (1992), pp. 17-26. http://geodesic.mathdoc.fr/item/ZNSL_1992_200_a1/
@article{ZNSL_1992_200_a1,
     author = {V. M. Babich},
     title = {The calculation of {\textquotedblleft}non-geometrical{\textquotedblright} wave $S^*$ by using of complex rays},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {17--26},
     year = {1992},
     volume = {200},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1992_200_a1/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The analitical formula for “non-geometrical” wave $S^*$ is obtained by using complex rays.