Smoothing noisy spectroscopic data with many-knot spline method
  In this paper, we present the development of a many-knot spline method derived to remove the statistical noise in the spectroscopic data. This method is an expansion of the B-spline method. Compared to the B-spline method, the many-knot spline method is significantly faster. 
M.H.Zhu, L.G.Liu, D.X.Qi, Z.You, A.A.Xu