Geodesic
Isohuygens deformation of the ultrahyperbolic operator
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 31, Tome 285 (2002), pp. 207-223

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New examples of the isohuygens deformation of the ultrahyperbolic operator and its powers with Calogero–Mozer and Lagnese–Stellmacher potentials. 
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     author = {S. P. Khekalo},
     title = {Isohuygens deformation of the ultrahyperbolic operator},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {207--223},
     publisher = {mathdoc},
     volume = {285},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2002_285_a14/}
}
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S. P. Khekalo. Isohuygens deformation of the ultrahyperbolic operator. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 31, Tome 285 (2002), pp. 207-223. http://geodesic.mathdoc.fr/item/ZNSL_2002_285_a14/