Improved Photometric Calibrations for Red Stars Observed with the SDSS Photometric Telescopev. 1342430–2434
Davenport, James R. A., Bochanski, John J., Covey, Kevin R., Hawley, Suzanne L., West, Andrew A., and Schneider, Donald P. 2007. "Improved Photometric Calibrations for Red Stars Observed with the SDSS Photometric Telescope." The Astronomical Journal, 134 2430–2434.