included consent statement

Author: RainerHeintzmann

docs/src/czt.md

@@ -1,7 +1,7 @@
 # CZTs
 Chirp Z Transformations: Allows Fourier-transformation and at the same time zooming into the result,
 which is why it is also called the Zoomed-FFT algorithm.
-The algorithm is based on a publication [Rabiner, Schafer, Rader, The Cirp z-Transform Algorithm, IEEE Trans AU 17(1969) p. 86] and a matlab Version written by the group of H. Gross. It currently needs three FFTs to perform its work.
+The algorithm is loosely based on a publication [Rabiner, Schafer, Rader, The Cirp z-Transform Algorithm, IEEE Trans AU 17(1969) p. 86] and a 2D Matlab Version written by N.G. Worku & H. Gross, with their consent (28. Oct. 2020) to make it openly available. It currently needs three FFTs to perform its work.
 As one of these FFTs only depends on the datasize and zoom parameters, it can be moved to a plan in future implementations.
 
 ```@docs

docs/src/resampling.md

@@ -78,7 +78,5 @@ FourierTools.resample_by_RFFT
 FourierTools.resample_nfft
 FourierTools.resample_czt
 FourierTools.upsample2
-FourierTools.upsample2_abs2
-FourierTools.upsample2_1D
 FourierTools.barrel_pin
 ```

src/czt.jl

@@ -6,9 +6,10 @@ export czt, iczt
 Chirp z transform along a single direction d of an ND array `xin` into the ND array 'xout'.
 Note that xin and xout can be the same array for inplace operations.
 Note that the result type is defined by `eltype(xin)` and not by `scales`.
-This code is based on a 2D Matlab version of the CZT, written by H. Gross et al.
-    
+
 #References: Rabiner, Schafer, Rader, The Cirp z-Transform Algorithm, IEEE Trans AU 17(1969) p. 86
+This code is loosely based on a 2D Matlab version of the CZT, written by N.G. Worku & H. Gross
+with their consent (28. Oct. 2020) to make it openly available.
 
 # Arguments:
 + `xin`: array to transform

src/resampling.jl

@@ -1,9 +1,7 @@
 export resample
 export resample_by_FFT
 export resample_by_RFFT
-export upsample2_abs2
 export upsample2
-export upsample2_1D
 export resample_nfft
 export resample_czt
 export barrel_pin