@incollection{Martens07,
author = {Christian Martens and Oliver Prenzel and Axel Graeser},
title = {The Rehabilitation Robots FRIEND-I & II: Daily Life Independency through Semi-Autonomous Task-Execution},
booktitle = {Rehabilitation Robotics},
publisher = {IntechOpen},
address = {Rijeka},
year = {2007},
editor = {Sashi S Kommu},
chapter = {9},
doi = {10.5772/5159},
url = {https://doi.org/10.5772/5159}
}