@article{MZM_1994_56_4_a9,
     author = {S. I. Novikov},
     title = {The periodic analog of {Rolle's} theorem for differential operators and approximation by $L$-splines},
     journal = {Matemati\v{c}eskie zametki},
     pages = {102--113},
     publisher = {mathdoc},
     volume = {56},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1994_56_4_a9/}
}