Geodesic
On orthogonal second order finite functions associated with triangular meshes and~their~application in mathematical modeling
Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, no. 1 (2011), pp. 241-243.

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Second order orthogonal finite functions are studied, their compact supports are local sets of grid triangles. The theorem on approximating the properties of sequences of sets of such functions is formulated. The applications in algorithms of mixed numerical methods of boundary value problems solution, in algorithms of linear approximation of surfaces are considered.
Keywords: orthogonal finite functions, triangular grids, approximating properties, mathematical modeling, boundary value problems, surface approximation. 
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V. L. Leont'ev; A. V. Kochulimov. On orthogonal second order finite functions associated with triangular meshes and~their~application in mathematical modeling. Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, no. 1 (2011), pp. 241-243. http://geodesic.mathdoc.fr/item/VSGTU_2011_1_a30/

[1] Marchuk G. I., Agoshkov V. I., Introduction to projection-grid methods, Nauka, Moscow, 1981, 416 pp. | MR | Zbl