Rotation-invariant recognition of character strings for Korean cadastral map digitizing. - Phill-Kyu Rhee; Jei S. Park; Yeon Gu Kang (ICDAR, 1995)

Real Time Head Nod and Shake Detection Using HMMs. - Yeon Gu Kang; Hyun Jea Joo; Phill-Kyu Rhee (KES (3), 2006)

Head Gesture Recognition Using Feature Interpolation. - Yeon Gu Kang; Phill-Kyu Rhee (KES (1), 2006)