Olawuwo, S., N. Forcheh, and K. Setlhare. “Inequalities in Child Survival in Nigeria: A Multilevel Modelling Approach”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 32, no. 1, May 2017, pp. 149-5, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/2977.