Guarna, Massimo. “The Nerve Fiber Relationship With Human Arrector Pili Muscle Cells: Electron Microscopy Findings”. Italian Journal of Anatomy and Embryology 116, no. 2 (November 23, 2011): 86. Accessed November 22, 2024. https://oajournals.fupress.net/index.php/ijae/article/view/4660.