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Sigmar Gabriel Sigmaringen Sigmaringen (huyện) Sigmaringendorf Sigmarszell Sigma Sigma Octantis Sigma Sagittarii Sigma Leonis Sigma PegasiTài liệu tham khảo
WikiPedia: Sigmar Gabriel http://www.theage.com.au/world/germany-to-enter-ar... http://www.bbc.com/news/world-middle-east-31786564 http://www.businessweek.com/news/2014-09-29/malmst... http://www.businessweek.com/news/2014-10-14/google... http://www.businessweek.com/news/2014-10-15/german... http://www.businessweek.com/news/2014-11-07/merkel... http://www.cnn.com/2017/05/29/europe/angela-merkel... http://www.dailynewsegypt.com/2015/03/11/germanys-... http://www.dw.com/en/controversial-exports-in-germ... http://www.dw.com/en/opinion-arms-exports-germany-...