Tài liệu tham khảo

WikiPedia: Trịnh_Xuân_Thuận http://www.canalacademie.com/Les-voies-de-la-lumie... http://www.vietkb.com/p/story/id-958/st-1.htm http://www.astro.virginia.edu/people/faculty/txt/ http://www.virginia.edu/uvatoday/newsRelease.php?i... http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://vietsciences.free.fr/docbao/tinhangngay/txt... http://vietsciences.free.fr/giaokhoa/vatly/thienva... http://vietsciences.free.fr/giaokhoa/vatly/thienva... http://vietsciences.free.fr/giaokhoa/vatly/thienva... http://vietsciences.free.fr/giaokhoa/vatly/thienva...