@article{ZNSL_2004_310_a3,
     author = {V. V. Zhikov},
     title = {On density of smooth functions in {Sobolev{\textendash}Orlich} spaces},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {67--81},
     year = {2004},
     volume = {310},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2004_310_a3/}
}