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"The Effect of Luminaire Type and Spacing on Visibility Levels in Unobstructed Spaces." IEEE-IAS Annual Conference. San Diego, CA, 1989. LBL-30178..
"Developing Practical Reflectors for Cylindrical and Compact Fluorescent Lamps Based on Nonimaging Optics." Annual IEEE-IAS Conference. Toronto, Ontario, Canada, 1993. LBL-35253..