You seem to be attempting to access an item that has been removed from the repository.
There is a later version of the item you are trying to access:
Jann, Thomas and diverse, andere DLR-Mitarbeiter (2012) MiTraPor II - Mid-Term Progress Report. DLR-Interner Bericht, Project Report. DLR-IB 111-2012/28, 51 S.