Yadav, R., N. Yadav, and P. Basel. “Prevalence of Lip Competency Among Nepalese Adolescents With Different Ethnic Group of Kathmandu Valley”. Orthodontic Journal of Nepal, vol. 9, no. 1, Sept. 2019, pp. 45-49, doi:10.3126/ojn.v9i1.25690.