Geodesic
Iso-Huygens deformations of the Cayley operator by the general Lagnese--Stellmacher potential
Izvestiya. Mathematics , Tome 67 (2003) no. 4, pp. 815-836.

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We construct and study iso-Huygens deformations of higher-order hyperbolic differential operators on the space of real symmetric matrices. Using the so-called skew symmetries, we introduce intertwining operators, which enable us to express fundamental solutions for these deformations in an explicit form and obtain conditions under which the strong Huygens principle holds for these deformations. 
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S. P. Khekalo. Iso-Huygens deformations of the Cayley operator by the general Lagnese--Stellmacher potential. Izvestiya. Mathematics , Tome 67 (2003) no. 4, pp. 815-836. http://geodesic.mathdoc.fr/item/IM2_2003_67_4_a5/

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