@article{MZM_1976_19_2_a1,
     author = {N. L. Zmatrakov},
     title = {A~necessary condition for convergence of interpolating parabolic and cubic splines},
     journal = {Matemati\v{c}eskie zametki},
     pages = {165--178},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_2_a1/}
}