Geodesic
On properties of Riemannian metrics associated with $B$-elliptic operators
Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Proceedings of the Voronezh Winter Mathematical School "Modern Methods of Function Theory and Related Problems." January 28 – February 2, 2019. Part 1, Tome 170 (2019), pp. 31-37.

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In this paper, we consider a Riemannian metric in which the Laplace–Beltrami operator coincides with a $B$-elliptic operator up to a factor.
Keywords: $B$-elliptic operator, Riemannian metric, Laplace–Beltrami operator, isometry group, Killing conditions, Lobachevsky geometry. 
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M. V. Polovinkina; I. P. Polovinkin. On properties of Riemannian metrics associated with $B$-elliptic operators. Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Proceedings of the Voronezh Winter Mathematical School "Modern Methods of Function Theory and Related Problems." January 28 – February 2, 2019. Part 1, Tome 170 (2019), pp. 31-37. http://geodesic.mathdoc.fr/item/INTO_2019_170_a2/

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