Guo ji fu wu wai bao wen ti yan jiu/ Guo ji fu wu wai bao wen ti yan jiu : Du zhi zui yi nan wen ti yan jiu/ Guo jia zhi li wen ti yan jiu/ Guo ji jiao yu fu wu mao yi fa lü wen ti yan jiu/ Shen ji du li xing wen ti yan jiu/ Guo ji bao gao wen xue yan jiu/ Guo ji fu wu wai bao de jing ji xiao ying yan jiu : Dang shi xue ji ben wen ti yan jiu/ Du li dan bao fa lv wen ti yan jiu/