@article{TM_1967_89_a2,
     author = {O. V. Besov},
     title = {On the density of functions with compact support in $\mathcal L_{p,\theta}^l$ and the extension of functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {18--30},
     publisher = {mathdoc},
     volume = {89},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1967_89_a2/}
}