参考文献是为撰写或编辑论文和著作而引用的有关文献信息资源 m是专著 j是期刊 c是会议论文 d是学位论文 p是专利 s是标准 db是数据库 ol是指联机网络 db/ol是联机网上数据库 db/mt是磁带数据库. 车牌上的汉字是省、自治区、直辖市简称，第一个字母表示该省的市、地区、自治州等地级或副省级的行政区、其中“a”表示省会城市。 “川a”表示成都市 川c 自贡市 川d 攀枝花市 川e 泸州市 川h 广元市
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