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2. Seasonal variation in the statistics of photosynthetically active radiation penetration in an oak-hickory forest;Baldocchi;Agric. For. Meteorol.,1986
3. Portable monitor for solar radiation that accumulates irradiance histograms for 32 leaf mounted sensors;Gutschik;Agric. For. Meteorol.,1985
4. On measuring in plant ecological studies;Hari;Flora,1983
5. Nonlinear dependence of photosynthetic rate on irradiance and its consequences for estimates of the amount of saccharides formed;Hari;Photosynthetica,1984