Illumination Face Spaces Are Idiosyncratic. - Jen-Mei Chang; J. Ross Beveridge; Bruce A. Draper; Michael Kirby; Holger Kley; Chris Peterson 001 (IPCV, 2006)

Recognition of Digital Images of the Human Face at Ultra Low Resolution Via Illumination Spaces. - Jen-Mei Chang; Michael Kirby; Holger Kley; Chris Peterson 001; Bruce A. Draper; J. Ross Beveridge (ACCV (2), 2007)

Principal Angles Separate Subject Illumination Spaces in YDB and CMU-PIE. - J. Ross Beveridge; Bruce A. Draper; Jen-Mei Chang; Michael Kirby; Holger Kley; Chris Peterson 001 (IEEE Trans. Pattern Anal. Mach. Intell., 2009)