Geodesic
Experimental proof of existence $K_r$-wave in cased boreholes
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 21, Tome 195 (1991), pp. 66-68 
P. V. Krauklis; M. V. Soferstein; L. S. Chlav. Experimental proof of existence $K_r$-wave in cased boreholes. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 21, Tome 195 (1991), pp. 66-68. http://geodesic.mathdoc.fr/item/ZNSL_1991_195_a7/
@article{ZNSL_1991_195_a7,
     author = {P. V. Krauklis and M. V. Soferstein and L. S. Chlav},
     title = {Experimental proof of existence $K_r$-wave in cased boreholes},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {66--68},
     year = {1991},
     volume = {195},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_195_a7/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

An unexpected wave in the cased borehole is considered. The nature of this wave is due to the sliding contact cement case with a surrounding medium.