A general approach to obtaining smoothed even-order derivative spectra using Fourier transforms is developed. The method is easier to use and yields higher signal-to-noise ratios than do techniques which involve the use of convolution functions.
David G. Cameron and Douglas J. Moffatt, "A Generalized Approach to Derivative Spectroscopy," Appl. Spectrosc. 41, 539-544 (1987)