Babies driving robots: self-generated mobility in very young infants. - James C. Galloway; Ji-Chul Ryu; Sunil Kumar Agrawal (Intell. Serv. Robotics, 2008)

Differentially flat mobile manipulators mounted with an under-actuated vertical arm. - Ji-Chul Ryu; Sunil Kumar Agrawal (ICRA, 2010)

Planning and control of under-actuated mobile manipulators using differential flatness. - Ji-Chul Ryu; Sunil Kumar Agrawal (Auton. Robots, 2010)

Differential flatness-based robust control of mobile robots in the presence of slip. - Ji-Chul Ryu; Sunil Kumar Agrawal (Int. J. Robotics Res., 2011)

Control of Nonprehensile Rolling Manipulation: Balancing a Disk on a Disk. - Ji-Chul Ryu; Fabio Ruggiero; Kevin M. Lynch (IEEE Trans. Robotics, 2013)

Contact Juggling of a Disk With a Disk-Shaped Manipulator. - Ji-Chul Ryu; Kevin M. Lynch (IEEE Access, 2018)