5Chen Baodong,Zhu Yongguan.Humic acids increase the phytoavailability of Cd and Pb to wheat plants cultivated in freshly spiked,contaminated soil[J].J Soils Sediments,2006,6(4):236.
6Li Wenzhen,Liang Changhai,Qiu Jieshan et al.Carbon nanotubes as support for cathode catalyst of a direct methanol fuel cell[J].Carbon,2002,40(7):787.
