@article{MZM_1989_45_1_a1,
     author = {A. L. Garkavi},
     title = {Haar's condition for systems of vector-valued functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {10--15},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_45_1_a1/}
}