@article{MZM_1999_66_4_a13,
     author = {V. I. Filippov},
     title = {Strong perturbations of the {Haar} system in the space $L_1(0,1)$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {596--602},
     publisher = {mathdoc},
     volume = {66},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_66_4_a13/}
}