@article{IM2_2018_82_1_a7,
     author = {I. I. Sharapudinov},
     title = {Sobolev-orthogonal systems of functions associated with an orthogonal system},
     journal = {Izvestiya. Mathematics },
     pages = {212--244},
     publisher = {mathdoc},
     volume = {82},
     number = {1},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2018_82_1_a7/}
}