L. ying Ding, Y. gang Li, and F. yu Han. Journal of Qingdao Institute of Chemical Technology, volume 24. Qingdao University of Science and Technology, (October 2003)
L. ying Ding, Y. gang Li, and F. yu Han. Journal of Qingdao Institute of Chemical Technology, volume 24. Qingdao University of Science and Technology, China, (September 2003)