1. Yung-Yu Chen
  2. pyengr

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Yung-Yu Chen  committed afc62c8

Add reference.

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File document/source/num_trans.rst

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 Integral Transform
 ==================
 
-At first let's define the Fourier transform pair as:
+At first let's define the Fourier transform pair as [1]_:
 
 .. math::
   :label: e:trans:forward
 defines the scaling relation between the Fourier transform and the discrete
 Fourier transform.
 
+.. [1] William L. Briggs and Van Emden Henson, *The DFT: An Owners' Manual for
+  the Discrete Fourier Transform*, SIAM, 1987.
+  http://www.amazon.com/gp/product/0898713420/
+
 .. vim: set spell ft=rst ff=unix fenc=utf8 ai et sw=4 ts=4 tw=79