Speech interaction strategies for a humanoid assistantSebastian Stüker, Stefan Constantin, Jan Niehues, Thai-Son Nguyen, Markus Müller, Ngoc Quan Pham, Robin Rüde and Alex WaibelMATEC Web Conf., 161 (2018) 01002DOI: https://doi.org/10.1051/matecconf/201816101002