Axel. - Pablo Abad-Manterola; Jeffrey A. Edlund; Joel W. Burdick; Albert Wu; Thomas Oliver; Issa A. D. Nesnas; Johanna Cecava (IEEE Robotics Autom. Mag., 2009)

Axel rover paddle wheel design, efficiency, and sinkage on deformable terrain. - Pablo Abad-Manterola; Joel W. Burdick; Issa A. D. Nesnas; Sandeep Chinchali; Christine Fuller; Xuecheng Zhou (ICRA, 2010)

Motion planning on steep terrain for the tethered axel rover. - Pablo Abad-Manterola; Issa A. D. Nesnas; Joel W. Burdick (ICRA, 2011)

Axel and DuAxel rovers for the sustainable exploration of extreme terrains. - Issa A. D. Nesnas; Jaret B. Matthews; Pablo Abad-Manterola; Joel W. Burdick; Jeffrey A. Edlund; Jack C. Morrison; Robert D. Peters; Melissa M. Tanner; Robert N. Miyake; Benjamin S. Solish; Robert C. Anderson (J. Field Robotics, 2012)