Tài liệu tham khảo WikiPedia: Văn_kiện_Viên http://www.auswaertiges-amt.de/DE/Aussenpolitik/Fr... http://www.spiegel.de/politik/deutschland/gauweile... http://www.state.gov/t/avc/cca/c43837.htm http://dtirp.dtra.mil/tic/synopses/vdoc99.aspx http://daitudien.net/luat-hoc/luat-hoc-ve-giai-tru... http://www.osce.org/fsc/86597 https://web.archive.org/web/20131111073623/http://...
