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Urbain Le Verrier Urbino Urban Decay (mỹ phẩm) Urban Dictionary Urbanus dorantes Urbania Urbano Noris Urbanus Urbana, Illinois UrbanaTài liệu tham khảo
WikiPedia: Urbain Le Verrier http://fultonhistory.com/Newspaper%2014/New%20York... http://books.google.com/books?id=fC4CAAAAYAAJ&pg=R... http://adsabs.harvard.edu/abs/1859AnPar...5....1L http://www-personal.umich.edu/~jbourj/money4.htm http://www.institut.math.jussieu.fr/~daubin/publis... http://www.dioi.org/vols/w91.pdf http://chrhc.revues.org/index248.html https://ui.adsabs.harvard.edu/abs/1910PA.....18..4... https://web.archive.org/web/20071129105436/http://...