Robots Asking for Favors: The Effects of Directness and Familiarity on Persuasive HRI. Saunderson, S. & Nejat, G. IEEE Robotics Autom. Lett., 6(2):1793–1800, 2021.  
Paper  doi  bibtex   @article{DBLP:journals/ral/SaundersonN21,
  author       = {Shane Saunderson and
                  Goldie Nejat},
  title        = {Robots Asking for Favors: The Effects of Directness and Familiarity
                  on Persuasive {HRI}},
  journal      = {{IEEE} Robotics Autom. Lett.},
  volume       = {6},
  number       = {2},
  pages        = {1793--1800},
  year         = {2021},
  url          = {https://doi.org/10.1109/LRA.2021.3060369},
  doi          = {10.1109/LRA.2021.3060369},
  timestamp    = {Tue, 23 Mar 2021 00:00:00 +0100},
  biburl       = {https://dblp.org/rec/journals/ral/SaundersonN21.bib},
  bibsource    = {dblp computer science bibliography, https://dblp.org}
} 
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