Geodesic
On locally concave functions on simplest nonconvex domain
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 50, Tome 512 (2022), pp. 40-87

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It is shown that certain Bellman functions of several variables are minimal locally concave functions. This generalizes earlier results about Bellman functions of two variables. 
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     author = {P. B. Zatitskiy and D. M. Stolyarov},
     title = {On locally concave functions on simplest nonconvex domain},
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P. B. Zatitskiy; D. M. Stolyarov. On locally concave functions on simplest nonconvex domain. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 50, Tome 512 (2022), pp. 40-87. http://geodesic.mathdoc.fr/item/ZNSL_2022_512_a4/