@article{SM_1970_10_1_a5,
     author = {P. I. Lizorkin},
     title = {Description of the spaces $L_p^r(R^n)$ in terms of singular difference integrals},
     journal = {Sbornik. Mathematics},
     pages = {77--89},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_10_1_a5/}
}