@article{ZVMMF_1993_33_1_a1,
     author = {N. L. Zmatrakov},
     title = {Approximate properties of two-dimensional splines of the third and fourth degree},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {12--21},
     year = {1993},
     volume = {33},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1993_33_1_a1/}
}