Morelli, Annamaria, et al. “Isolation and Characterization of Human Cholinergic Neurons from Fetal Nucleus Basalis of Meynert”. Italian Journal of Anatomy and Embryology, vol. 120, no. 1, Sept. 2015, p. 181, https://oajournals.fupress.net/index.php/ijae/article/view/4137.