1[3]W·Hardle “Applied Nonparametric Regressin”Cambridge University Press,1990.
2[4]J·Fan and I·Gijbels “Local Polynomial Modelling and Its Applications”Chapman & Hall,First edition 1996.
3[5]Edited by John Creedy and Vance L.Martin “Nonlinear Economic Models:Cross-sectional,Time Series and Neural Network Application”Edward Elgar Publishing,Inc.1997.
