TY - JOUR AU - N. L. Zmatrakov TI - Approximate properties of two-dimensional splines of the third and fourth degree JO - Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki PY - 1993 SP - 12 EP - 21 VL - 33 IS - 1 UR - http://geodesic.mathdoc.fr/item/ZVMMF_1993_33_1_a1/ LA - ru ID - ZVMMF_1993_33_1_a1 ER -