Toward A Ballbot for Physically Leading People: A Human-Centered Approach. - Zhongyu Li 003; Ralph Hollis (IROS, 2019)

Wheelchair Maneuvering with a Single-Spherical-Wheeled Balancing Mobile Manipulator. - Cunxi Dai; Xiaohan Liu; Roberto Shu; Ralph Hollis (IROS, 2024)

Interactive Navigation with Adaptive Non-prehensile Mobile Manipulation. - Cunxi Dai; Xiaohan Liu; Koushil Sreenath; Zhongyu Li 003; Ralph Hollis (CoRR, 2024)

Wallbounce : Push wall to navigate with Contact-Implicit MPC. - Xiaohan Liu; Cunxi Dai; John Z. Zhang; Arun L. Bishop; Zachary Manchester; Ralph Hollis (CoRR, 2024)