Onyinye, David-Wayas, Ugbor I Kalu, Arua Martha, and Nwanosike Dominic U. “Analysis of Inequality in Healthcare Utilization Among Pregnant Women in Nigeria: Concentration Index Approach”. International Journal of Asian Social Science 7, no. 5 (March 27, 2017): 424–433. Accessed May 18, 2024. https://archive.aessweb.com/index.php/5007/article/view/2892.