A. ALBAY, Özgül KISA, M. BAYSALLAR, A. BAŞUSTAOĞLU, and H. GÜN, “Determination of IgG by Elisa Method Using PPD as the Antigen in Sera of Patients With Pulmonary Tuberculosis”, Eur J Ther, vol. 5, no. 1, pp. 71–76, Jan. 1994.