Add references to demo

Change-Id: I15ed9aead9fb281d93915f948e6d1f206b0d914e
diff --git a/examples/references.bib b/examples/references.bib
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+@Manual{R-rmarkdown,
+  title = {rmarkdown: Dynamic Documents for R},
+  author = {JJ Allaire and Yihui Xie and Christophe Dervieux and Jonathan McPherson and Javier Luraschi and Kevin Ushey and Aron Atkins and Hadley Wickham and Joe Cheng and Winston Chang and Richard Iannone},
+  year = {2023},
+  note = {R package version 2.22},
+  url = {https://CRAN.R-project.org/package=rmarkdown},
+}
+
+@inproceedings{kupietz_rkorapclient_2020,
+        address = {Marseille, France},
+        title = {{RKorAPClient}: {An} {R} {Package} for {Accessing} the {German} {Reference} {Corpus} {DeReKo} via {KorAP}},
+        isbn = {979-10-95546-34-4},
+        url = {https://www.aclweb.org/anthology/2020.lrec-1.867},
+        language = {English},
+        booktitle = {Proceedings of the 12th {Language} {Resources} and {Evaluation} {Conference}},
+        publisher = {European Language Resources Association},
+        author = {Kupietz, Marc and Diewald, Nils and Margaretha, Eliza},
+        month = may,
+        year = {2020},
+        pages = {7015--7021},
+}
+