Z. Zhang, A. Pegg, Y. Ikeguchi, and E. Alexov. Enhancing Human Spermine Synthase Activity by Site Directed Mutations. Biophysical Journal, Elsevier, volume 104, issue 2, pages 380a, 2013. Z. Zhang, Y. Zheng, M. Petukh, A. Pegg, Y. Ikeguchi, and E. Alexov. Enhancing human spermine synthase activity by engineered mutations. PLoS Comput Biol, Public Library of Science, volume 9, issue 2, pages e1002924, 2013.