Okolugbo, Nekwu Emmanuel. “Role of Tympanometry in the Diagnosis of Hearing Impairment in Children With Otitis Media and Effusion”. African Journal of Tropical Medicine and Biomedical Research, vol. 1, no. 4, Nov. 2020, pp. 37-40, https://ajtmbr.org.ng/index.php/home/article/view/26.