ProVAR Assistive Robot System Architecture. - H. F. Machiel Van der Loos; J. Joseph Wagner; Niels Smaby; Kyong-Sok Chang; O. Madrigal; Larry J. Leifer; Oussama Khatib (ICRA, 1999)

Construction of social relationships between user and robot. - J. Joseph Wagner; H. F. Machiel Van der Loos; Larry J. Leifer (Robotics Auton. Syst., 2000)