@article{MZM_1976_19_6_a10,
     author = {A. A. Ligun},
     title = {Exact inequalities for splines and best quadrature formulas for certain classes of functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {913--926},
     publisher = {mathdoc},
     volume = {19},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_6_a10/}
}