1. Hoffman, G.: Evaluating fluency in human–robot collaboration. IEEE Trans. Hum.-Mach. Syst. 1–10 (2019). https://doi.org/10.1109/THMS.2019.2904558
2. Hoffman, G.: Evaluating fluency in human-robot collaboration. HRI Work. Hum. Robot Collab. 2013 (2013)
3. Hoffman, G.: Evaluating fluency in human-robot collaboration. Robot. Sci. Syst. Work. Hum. Robot Collab. 381, 1–8 (2013)
4. Hoffman, G., Breazeal, C.: Cost-based anticipatory action selection for human-robot fluency. IEEE Trans. Robot. 23, 952–961 (2007). https://doi.org/10.1109/TRO.2007.907483
5. Merriam-Webster: Merriam - Webster dictionary. http://www.merriam-webster.com/dictionary/teamwork