Ahmad Zabidi, N., A. Nazrul Rosli, H. Abu Kassim, S. K.N, R. P.V, and D. V.R. “Adsorption of Atoms on Thymine: Density Functional Theory”. Malaysian Journal of Science, vol. 26, no. 2, Aug. 2007, pp. 99-109, http://mojes.um.edu.my/index.php/MJS/article/view/8074.