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Young, Lisa M.; Bendo, George J.; Lucero, Danielle M. (13 January 2009). «Mid- to Far-Infrared Emission and Star Formation in Early-Type Galaxies». The Astronomical Journal137 (2): 3053–3070. doi:10.1088/0004-6256/137/2/3053. Bibcode: 2009AJ....137.3053Y.