1) Guo Xiaoxia, Fang Jianhua, "Sulfonated alkoxy aromatic diamines and their hydrochlorides and their preparation methods" CN1634880 (2005)
2) Fang Jianhua, Guo Xiaoxia, "Preparation method of cross-linked sulfonated polyimide membrane" CN1730517 (2006)
3) Fang Jianhua, Guo Xiaoxia, Chen Binwu, Cai Huaming, "A method for preparing cross-linked sulfonated polyimide membrane" "New method for membranes", CN1765958 (2006)
4) Fang Jianhua, Guo Xiaoxia, "Preparation method of aromatic dihydroxydiamino compounds" CN1660776 (2005)