@article{MZM_1980_28_6_a5,
     author = {V. I. Ivanov and V. A. Yudin},
     title = {Trigonometric system in $L_p$, $0<p<1$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {859--868},
     publisher = {mathdoc},
     volume = {28},
     number = {6},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_28_6_a5/}
}