Karki, S., B. R. Tiwari, P. Ghimire, A. Maharjan, and M. Rajkarnikar. “Seroprevalence of Specific Antibodies to Treponema Pallidum in Blood Donors”. Journal of Nepal Health Research Council, vol. 6, no. 2, Aug. 2009, pp. 98-101, https://nepjol.info./index.php/JNHRC/article/view/2212.