@article{105513, author = {Pavel Doktor}, title = {On the density of smooth functions in certain subspaces of Sobolev space}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {014}, year = {1973}, pages = {609-622}, zbl = {0268.46036}, mrnumber = {0336317}, language = {en}, url = {http://dml.mathdoc.fr/item/105513} }
Doktor, Pavel. On the density of smooth functions in certain subspaces of Sobolev space. Commentationes Mathematicae Universitatis Carolinae, Tome 014 (1973) pp. 609-622. http://gdmltest.u-ga.fr/item/105513/
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