1. Bogart, R. S., Discher de Sá, L. A., Kuhn, J. R., et al. 1996, SOI Technical note 96-134, http://soi.stanford.edu/technotes/96.134.html
2. The structure of sunspots
3. Fast Flat Fields from Scanning Extended Sources
4. Hoeksema, J. T. 1996, SOI Technical note 96-132, Precision of the MDI Continuum Intensity, http://soi.stanford.edu/technotes/96.132.html