Optimal Kernel Shapes for Local Linear Regression.

Dirk Ormoneit Trevor Hastie Optimal Kernel Shapes for Local Linear Regression. 540-546 http://nips.djvuzone.org/djvu/nips12/0540.djvu 1999 conf/nips/1999 NIPS db/conf/nips/nips1999.html#OrmoneitH99