Li, S. S., Y. Li, L. L. Sun, B. Z. Hu, and Y. Chang. “Identification and Expression Analysis of 4-Coumarate: Coenzyme A Ligase Gene Family in Dryopteris Fragrans”. Cellular and Molecular Biology, vol. 61, no. 4, Aug. 2015, pp. 25-33, https://www.cellmolbiol.org/index.php/CMB/article/view/683.