@article{ZNSL_2017_456_a6,
     author = {L. N. Ikhsanov},
     title = {Estimation of functions orthogonal to piecewise constant functions in terms of the second modulus of continuity},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {96--106},
     publisher = {mathdoc},
     volume = {456},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2017_456_a6/}
}