@article{SM_1991_69_2_a7,
     author = {V. A. Yudin},
     title = {Riesz transforms and partial derivatives},
     journal = {Sbornik. Mathematics},
     pages = {445--451},
     publisher = {mathdoc},
     volume = {69},
     number = {2},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1991_69_2_a7/}
}