Karki, S., B. R. Tiwari, P. Ghimire, A Maharjan, and M Rajkarnikar. 2009. “Seroprevalence of Specific Antibodies to Treponema Pallidum in Blood Donors”. Journal of Nepal Health Research Council 6 (2):98-101. https://nepjol.info./index.php/JNHRC/article/view/2212.