@article{TM_1990_192_a8,
     author = {A. Kufner and H. P. Heinig},
     title = {Hardy's inequality for higher order derivatives},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {105--113},
     publisher = {mathdoc},
     volume = {192},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1990_192_a8/}
}