Kareem, A.O., I.O. Oshungade, and G.M. Oyeyemi. 2016. “An Improvement on Some Approximate Solutions to Dalenius Equation”. Al-Hikmah Journal of Pure and Applied Sciences (AJPAS) 2 (2): 130-42. https://alhikmahuniversity.edu.ng/AJPAS/index.php/journal/article/view/145.