Geodesic
The best error estimate for linear interpolation on a triangle of
Doklady Akademii Nauk, Tome 300 (1988) no. 4, pp. 811-814 
G. L. Siganevich. The best error estimate for linear interpolation on a triangle of. Doklady Akademii Nauk, Tome 300 (1988) no. 4, pp. 811-814. http://geodesic.mathdoc.fr/item/DAN_1988_300_4_a9/
@article{DAN_1988_300_4_a9,
     author = {G. L. Siganevich},
     title = {The best error estimate for linear interpolation on a triangle of},
     journal = {Doklady Akademii Nauk},
     pages = {811--814},
     year = {1988},
     volume = {300},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_300_4_a9/}
}
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