Zheng, J.(1999). Activation of the Mitogen-Activated Protein Kinase Cascade Is Necessary But Not Sufficient for Basic Fibroblast Growth Factor- and Epidermal Growth Factor-Stimulated Expression of Endothelial Nitric Oxide Synthase in Ovine Fetoplacental Artery Endothelial Cells. Endocrinology, 140(3), 1399-1407. doi:10.1210/en.140.3.1399

Zheng, J. "Activation of the Mitogen-Activated Protein Kinase Cascade Is Necessary But Not Sufficient for Basic Fibroblast Growth Factor- and Epidermal Growth Factor-Stimulated Expression of Endothelial Nitric Oxide Synthase in Ovine Fetoplacental Artery Endothelial Cells". Endocrinology, 140.3 ( 1999 ): 1399-1407.