Add F&K citation

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 # pyderekovecs
 
-A Python client package that makes the DeReKoVecs web service API accessible from Python.
+A Python client package that makes the DeReKoVecs (Fankhauser & Kupietz, 2022) web service API accessible from Python.
 
 ## Installation
 
@@ -92,3 +92,7 @@
 ## References
 
 Margaretha, E., & Lüngen, H. (2014). Building linguistic corpora from Wikipedia articles and discussions. *Journal for Language Technology and Computational Linguistics, 29*(2), 59–82. https://doi.org/10.21248/jlcl.29.2014.189
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+Fankhauser, Peter/Kupietz, Marc (2022): Count-based and predictive language models for exploring DeReKo. In: BaƄski, Piotr/Barbaresi, Adrien/Clematide, Simon/Kupietz, Marc/Lüngen, Harald (eds.): *Proceedings of the LREC 2022 Workshop on Challenges in the Management of Large Corpora (CMLC-10 2022)*. Marseille, 20 June 2022. Paris: European Language Resources Association (ELRA), pp. 27–31. <https://aclanthology.org/2022.cmlc-1.5/>
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+Margaretha, Eliza/Lüngen, Harald (2014): Building linguistic corpora from Wikipedia articles and discussions. *Journal for Language Technology and Computational Linguistics*, 29(2), pp. 59–82. https://doi.org/10.21248/jlcl.29.2014.189.