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Prabhu, TP and Mayya, YD and Anupama, GC (1992) Gain calibration of CCD systems at VBO. In: Journal of Astrophysics & Astronomy, 13 (1). pp. 129-144.
Mayya, YD (1991) Photometric calibration of the CCD camera of 1-m telescope at VBO. In: Journal of Astrophysics & Astronomy, 12 (4). 319 -331.