Geodesic
The area of surfaces on sub-Lorentzian structures of depth two
Matematičeskie trudy, Tome 26 (2023) no. 1, pp. 93-119.

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For contact mappings of Carnot groups of depth two whose image is endowed with a sub-Lorentzian structure, we prove local properties of the surfaces-images and explicitly deduce a sub-Lorentzian analog of the area formula. The result in particular also holds for Lipschitz mappings in the sub-Riemannian sense. 
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M. B. Karmanova. The area of surfaces on sub-Lorentzian structures of depth two. Matematičeskie trudy, Tome 26 (2023) no. 1, pp. 93-119. http://geodesic.mathdoc.fr/item/MT_2023_26_1_a4/

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