@article{IM2_1970_4_5_a9,
     author = {B. V. Ryazanov and A. N. Slepchenko},
     title = {Orthogonal bases in $L^p$},
     journal = {Izvestiya. Mathematics },
     pages = {1169--1181},
     publisher = {mathdoc},
     volume = {4},
     number = {5},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_5_a9/}
}