More efficient fluid power systems using variable displacement hydraulic motors Biedermann, Olaf Engelhardt, Joerg Geerling, Gerhard 1998 - TUHH Open Research - frei zugänglich
Power control units with secondary controlled hydraulic motors - a new concept for application in aircraft high lift systems Biedermann, Olaf Geerling, Gerhard 1998 - TUHH Open Research - frei zugänglich