Breaking Audio CAPTCHAs. - Jennifer Tam; Jirí Simsa; Sean Hyde; Luis von Ahn (NIPS, 2008)

CHIMP, the CMU Highly Intelligent Mobile Platform. - Anthony Stentz; Herman Herman; Alonzo Kelly; Eric Meyhofer; G. Clark Haynes; David Stager; Brian Zajac; J. Andrew Bagnell; Jordan Brindza; Christopher M. Dellin; Michael David George; Jose Gonzalez-Mora; et al. (J. Field Robotics, 2015)