@article{ZNSL_2004_314_a6,
     author = {A. S. Zhuk and V. V. Zhuk},
     title = {Some orthogonalities in approximation theory},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {83--123},
     year = {2004},
     volume = {314},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2004_314_a6/}
}