Webster, Amy K., ほか. 「The Role of Age-Structure in the Optimal Germination Fraction of Seeds」. Mathematical and Computational Forestry & Natural-Resource Sciences (MCFNS), 巻 6, 号 1, 2014年3月, ページ 26-35 (10), https://mcfns.com/index.php/Journal/article/view/6.3.