Add publication to README

Add classical study to that utilized the GW data set

README.md

@@ -183,7 +183,7 @@ Studies where the dataset from Grundtvig’s Works has been used:
 
 - Baunvig, K. F., & Nielbo, K. L. (2022). Mermaids are Birds: Embedding N.F.S. Grundtvig’s Bestiary. I K. Berglund, M. La Mela, & I. Zwart (red.), Proceedings of the 6th Digital Humanities in the Nordic and Baltic Countries Conference (DHNB 2022) (Bind 3232, s. 23-32). CEUR-WS.org. http://ceur-ws.org/Vol-3232/paper02.pdf
 - Baunvig, K. F., Jarvis, O., & Nielbo, K. L. (2021). Emotional Imprints: Exclamation Marks in N.F.S. Grundtvig's Writings. I S. Reinsone, I. Skadiņa, J. Daugavietis, & A. Baklāne (red.), Post-Proceedings of the 5th Conference Digital Humanities in the Nordic Countries (DHN 2020) (s. 156-169) http://ceur-ws.org/Vol-2865/short7.pdf
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+- Nielbo, K.L., Baunvig, K. F., Liu, B., & Gao, J. (2019). A Curious Case of Entropic Decay: Persistent Complexity in Textual Cultural Heritage. Digital Scholarship in the Humanities, Volume 34, Issue 3, September 2019, Pages 542–557, https://doi.org/10.1093/llc/fqy054.
 
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