Photometric CCD sequences for calibration of the ESO/SERC atlas B. Cunow, R. Duemmler, G. Spiekermann, R. Ungruhe and W. F. Wargau Astron. Astrophys. Suppl. Ser., 125 1 (1997) 71-73 Published online: 15 October 1997 DOI: 10.1051/aas:1997212