Geodesic
Approximate properties of two-dimensional splines of the third and fourth degree
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 33 (1993) no. 1, pp. 12-21 
N. L. Zmatrakov. Approximate properties of two-dimensional splines of the third and fourth degree. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 33 (1993) no. 1, pp. 12-21. http://geodesic.mathdoc.fr/item/ZVMMF_1993_33_1_a1/
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