"Vergabekalender"(PDF) (in German). Ministerium für Verkehr Baden-Württemberg. February 2021. Archived from the original(PDF) on 11 April 2021. Retrieved 22 February 2022.
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"Vergabekalender"(PDF) (in German). Ministerium für Verkehr Baden-Württemberg. February 2021. Archived from the original(PDF) on 11 April 2021. Retrieved 22 February 2022.