@article{MZM_1992_52_5_a13,
     author = {K. V. Runovskii},
     title = {A direct theorem on approximation ``by angle'' in the spaces $L_p$, $0<p<1$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {93--96},
     publisher = {mathdoc},
     volume = {52},
     number = {5},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_52_5_a13/}
}