MOHAMMED, Gina H. - NOLAND, Thomas L. Influence of time of day and sampling methodology on chlorophyll fluorescence in Jack Pine (Pinus banksiana Lamb.) Black Spruce (Picea mariana (Mill.) B.S.P.) and Eastern White Pine (Pinus strobus L.). Sault Ste. Marie : Ontario Forest Research Institute, 1997. iii, 14 s. Forest Research Report, No. 142. ISBN 0-7778-5969-3. ISSN 0381-3924.