Chee Kheng, T., R. Yusof, and N. Abd. Rahman. “Construction of Combinatorial “Library” of Cyclopeptides and Screening for Biological Activities”. Malaysian Journal of Science, vol. 22, no. 1, Apr. 2003, pp. 29-34, https://sare.um.edu.my/index.php/MJS/article/view/8797.