Update citations

Author: jurihock

CITATION.cff

@@ -22,13 +22,6 @@ references:
         given-names: Russell
     url: http://hdl.handle.net/2027/spo.bbp2372.2005.086
     type: article
-  - title: "Accurate, Guaranteed Stable, Sliding Discrete Fourier Transform"
-    authors:
-      - family-names: Duda
-        given-names: Krzysztof
-    url: https://ieeexplore.ieee.org/document/5563098
-    doi: 10.1109/MSP.2010.938088
-    type: article
   - title: "Fast, Accurate Frequency Estimators"
     authors:
       - family-names: Jacobsen

README.md

@@ -38,9 +38,7 @@ If you're interested in Sliding DFT with *linear* frequency resolution, don't fo
 
 2. <span id="2">Russell Bradford et al. (2005). Sliding is Smoother Than Jumping. International Computer Music Conference Proceedings. http://hdl.handle.net/2027/spo.bbp2372.2005.086</span>
 
-3. <span id="3">Krzysztof Duda (2010). Accurate, Guaranteed Stable, Sliding Discrete Fourier Transform. IEEE Signal Processing Magazine. https://ieeexplore.ieee.org/document/5563098</span>
-
-4. <span id="4">Eric Jacobsen and Peter Kootsookos (2007). Fast, Accurate Frequency Estimators. IEEE Signal Processing Magazine. https://ieeexplore.ieee.org/document/4205098</span>
+3. <span id="3">Eric Jacobsen and Peter Kootsookos (2007). Fast, Accurate Frequency Estimators. IEEE Signal Processing Magazine. https://ieeexplore.ieee.org/document/4205098</span>
 
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