Geodesic
Оn optimal choice of interpolation spline on triangular net
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 5 (2005) no. 1, pp. 26-33.

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ln this paper we find а Hermite Spline оп atriangle for the approximation error of its derivatives with respect to а side of this triangle are inversely proportional to length of this side. 
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Yu. V. Kupriyanova; S. F. Lukomskiy. Оn optimal choice of interpolation spline on triangular net. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 5 (2005) no. 1, pp. 26-33. http://geodesic.mathdoc.fr/item/ISU_2005_5_1_a2/

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