Geodesic
Eigenfunctions of the continuous spectrum in the problem of acoustic oscillations in a wedge-shaped domain bounded by an angular junction of two semi-infinite thin elфstic membranes
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 53, Tome 521 (2023), pp. 123-135

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In this work we compute the eigenfunctions of the continuous (essential) spectrum in the form of the Sommerfeld integral. The eigenfunctions are localised near the membranes and can be interpreted as incoming and outgoing surface waves. 
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     author = {M. A. Lyalinov},
     title = {Eigenfunctions of the continuous spectrum in the problem of acoustic oscillations in a wedge-shaped domain bounded by an angular junction of two semi-infinite thin el{\cyrf}stic membranes},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {123--135},
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     volume = {521},
     year = {2023},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_2023_521_a7/}
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M. A. Lyalinov. Eigenfunctions of the continuous spectrum in the problem of acoustic oscillations in a wedge-shaped domain bounded by an angular junction of two semi-infinite thin elфstic membranes. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 53, Tome 521 (2023), pp. 123-135. http://geodesic.mathdoc.fr/item/ZNSL_2023_521_a7/