@misc{li_tests_with_1991, 
author={Li, F. Q.,Niemann, H.-R.,Aust, E.},
title={Tests with TITAN 7F manipulator},
year={1991},
howpublished = {GKSS report},
note = {Online available at: \url{} (DOI). Li, F.; Niemann, H.; Aust, E.: Tests with TITAN 7F manipulator. GKSS 91-E-87. 1991.}}