%0 Journal Article %A L. Gajek %A A. Lenic %T An approximate necessary condition for the optimal bandwidth selector in kernel density estimation %J Applicationes Mathematicae %D 1993 %P 123-138 %V 22 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/am-22-1-123-138/ %R 10.4064/am-22-1-123-138 %G en %F 10_4064_am_22_1_123_138