Chen, Xiongwen. ‘ENTROPY DYNAMICS IN CONE PRODUCTION OF LONGLEAF PINE FORESTS IN THE SOUTHEASTERN UNITED STATES’. Mathematical and Computational Forestry & Natural-Resource Sciences (MCFNS), τ. 8, τχ. 2, Σεπτέμβριος 2016, σελ. 11-15 (5), https://mcfns.com/index.php/Journal/article/view/8.8.