add info on dissertation

src/about.mdx

@@ -12,16 +12,23 @@
 
 ## How to Cite
 
-If you want to cite this project, please use the following reference:
+If you want to cite this database, please use the following reference:
 
 * Dîlan Canan Çakir, Frank Fischer: **Dramatische Metadaten. Die Datenbank deutschsprachiger Einakter 1740–1850.** In: DHd2022: »Kulturen des digitalen Gedächtnisses«. 7–11 March 2022. Book of Abstracts. University of Potsdam. ([doi:10.5281/zenodo.6327977](https://doi.org/10.5281/zenodo.6327977))
 
 ## What Is This?
 
 This database is derived from Dîlan's working corpus for her dissertation
-on one-act plays (submitted in October 2021, defended in December 2022). The
-growing collection is also intended to provide a general quantitative overview
-of German-language one-act plays between the mid-18th and mid-19th centuries.
+on one-act plays, which was submitted in October 2021, defended in December
+2022, and published in June 2024:
+
+* Dîlan Canan Çakir: **[Poetische Ökonomie im Drama. Einakter im 18. und
+  frühen 19. Jahrhundert.](https://www.degruyter.com/document/isbn/9783111334059/html)**
+  De Gruyter 2024. (= Studien und Texte zur Sozialgeschichte der Literatur. Band 164.)
+
+The collection of one-act plays, which is still actively maintained, is intended to
+provide a general quantitative overview of German-language one-act plays between the
+mid-18th and mid-19th centuries.
 
 For each play we list metadata and links to other projects, if available
 (editions at Google Books, Wikidata identifiers, DraCor,