[Translate to English:] Eine kleine Figur sitzt auf einem aufgeschlagenen Buch
© Srinivas Bandari, Unsplash

According to § 6 (g) of the Doctoral Regulations 2025, you must provide a proof of attendance at an introduction to literature research (Einführung in die Literatursuche) recognised by the doctoral committee when submitting the dissertation announcement.

You can take such a course here: