Sharples, S.; Shea, A. D. (Dec 1999). "Roof obstructions and daylight levels in atria: a model study under real skies". Lighting Research and Technology. 31 (4). SAGE Publications: 181–185. doi:10.1177/096032719903100408. S2CID109961211.
Sharples, S.; Shea, A. D. (Dec 1999). "Roof obstructions and daylight levels in atria: a model study under real skies". Lighting Research and Technology. 31 (4). SAGE Publications: 181–185. doi:10.1177/096032719903100408. S2CID109961211.