@article{TM_1975_138_a5,
     author = {Yu. N. Subbotin},
     title = {Extremal problems of functional interpolation, and mean interpolation splines},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {118--173},
     publisher = {mathdoc},
     volume = {138},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1975_138_a5/}
}