Salem, M., Kopp, S., Wachsmuth, I., Rohlfing, K., &; Joublin, F. (2012). Generation and evaluation of communicative robot gesture. International Journal of Social Robotics, Special Issue on Expectations, Intentions, and Actions, 4(2), 201–217.https://doi.org/10.1007/s12369-011-0124-9 

Salem, M., Kopp, S., Wachsmuth, I., Rohlfing, K., &; Joublin, F. (2012). Generation and evaluation of communicative robot gesture. International Journal of Social Robotics, Special Issue on Expectations, Intentions, and Actions, 4(2), 201–217.https://doi.org/10.1007/s12369-011-0124-9