Nermien E. Waly. “Immunohistochemical Localization of Hyperpolarization Activated Current Channel Subunits in Rat Suprachiasmatic Nucleus”. Global Journal of Medical Research, vol. 16, no. K5, Mar. 2016, pp. 9-15, https://medicalresearchjournal.org/index.php/GJMR/article/view/1164.