B. E. ONGO NKOA, R. . ZOGO EKASSI, and J. S. Song , Trans., “Urbanization, Industrialization and Inequalities in Africa: does threshold matter?”, int.jour.sci.res.mana, vol. 9, no. 08, pp. 2337–2352, Aug. 2021, doi: 10.18535/ijsrm/v9i08.em01.