@article{RM_1979_34_4_a9,
     author = {{\DJ}inh Dung},
     title = {Some approximative characteristics of~the~classes of~smooth functions of~several variables in~the~metric of~$\mathscr L_2$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {161--162},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1979_34_4_a9/}
}