Toward Affective Cognitive Robots for Human-Robot Interaction. - Matthias Scheutz; James F. Kramer; Christopher Middendorff; Paul W. Schermerhorn; Michael Heilman; David Anderson; P. Bui (AAAI, 2005)

DIARC: A Testbed for Natural Human-Robot Interaction. - Paul W. Schermerhorn; James F. Kramer; Christopher Middendorff; Matthias Scheutz (AAAI, 2006)

Multi-Modal Biometrics Involving the Human Ear. - Christopher Middendorff; Kevin W. Bowyer; Ping Yan (CVPR, 2007)