Bhattarai, Rosina, et al. “Oral Hygiene and Periodontal Health Status of Urban Population of Kathmandu District: A Pilot Study”. Journal of Nepalese Society of Periodontology and Oral Implantology, vol. 1, no. 1, June 2017, pp. 12-16, doi:10.3126/jnspoi.v1i1.23521.