Design and Implementation of a System for Autonomous Repair Welding. - Matthias Hackel; Stefan Kremer-Wasmuht; Günther Starke (WISES, 2003)

A Humanoid Interaction Robot for Information, Negotiation and Entertainment Use. - Matthias Hackel; Stefan Schwope (Int. J. Humanoid Robotics, 2004)

Humanoid robot platform suitable for studying embodied interaction. - Matthias Hackel; Stefan Schwope; Jannik Fritsch; Britta Wrede; Gerhard Sagerer (IROS, 2005)

Designing a sociable humanoid robot for interdisciplinary research. - Matthias Hackel; Stefan Schwope; Jannik Fritsch; Britta Wrede; Gerhard Sagerer (Adv. Robotics, 2006)

The Bielefeld anthropomorphic robot head "Flobi". - Ingo Lütkebohle; Frank Hegel; Simon Schulz; Matthias Hackel; Britta Wrede; Sven Wachsmuth; Gerhard Sagerer (ICRA, 2010)