What is XXX's place of employment?
Oussama Khatib
An object-level framework'', The International Journal of Robotics Research 14 (1): 19--36, doi:10.1177/027836499501400103 Bruno Siciliano & Oussama Khatib, ed. (2008), Springer Handbook of Robotics, Springer, ISBN 978-3-540-23957-4.