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WikiPedia: Thứ_tự_yếu http://www.econ.uzh.ch/static/wp/econwp207.pdf http://www.highbeam.com/doc/1G1-162753665.html http://dml.cz/bitstream/handle/10338.dmlcz/128450/... http://www.ams.org/mathscinet-getitem?mr=0332508 http://www.ams.org/mathscinet-getitem?mr=0332508 http://www.ams.org/mathscinet-getitem?mr=0130837 http://www.ams.org/mathscinet-getitem?mr=0130837 http://www.ams.org/mathscinet-getitem?mr=0078632 http://www.ams.org/mathscinet-getitem?mr=0078632 http://www.ams.org/mathscinet-getitem?mr=1759929