1Engle, R. F, Granger, C. W. J., Rice, J.A. and Weiss.A Semi-para- metric estimates of the relation, be- tween weather and electricity sales [J]. J. Amer. Statist. Assoc,1986,(81): 310-320.
2Green, P J.,Jennison, C, and Seheult, A. Analysis of field experiments by least squares smoothing[J]. J. ROy. Statistic. soc.Bi 1985(47):299-315.