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如何添加第二个引用？

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如何添加第二个引用？

我已经并且它有效

@misc{GDP:2012,
ALTauthor = {The World Bank},
ALTeditor = {},
title = {GDP Per Capita (Current \$US)},
year = {2012},
url = {http://data.worldbank.org/indicator/NY.GDP.PCAP.CD},
}

并且我尝试在它之后添加第二个引用，如下所示：

@misc{GDP:2012,
ALTauthor = {The World Bank},
ALTeditor = {},
title = {GDP Per Capita (Current \$US)},
year = {2012},
url = {http://data.worldbank.org/indicator/NY.GDP.PCAP.CD},
}


{GDP:2013,
ALTauthor = {The World Bank3},
ALTeditor = {Sexolopianos},
title = {GDP Per Capita (Current \$US)},
year = {2013},
url = {http://data.worldbank.org/iffdicator/NY.GDP.PCAP.CD},
}

但它不起作用。要添加第二个源才能使其工作，应该怎么做？

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