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Leonhard Euler Leonhard von Blumenthal Leonardo DiCaprio Leonardo da Vinci Leonardo Bonucci Leonardo Araújo Leonardo S.p.A. Leonard Cohen Leonardo Sernicola Leonard BernsteinTài liệu tham khảo
WikiPedia: Leonhard Euler //nla.gov.au/anbd.aut-an35069249 http://www.hls-dhs-dss.ch/textes/f/F018751.php http://www.17centurymaths.com/contents/euler/e002t... http://ahdictionary.com/word/search.html?q=Euler,+... http://www.bookofdaystales.com/euler http://www.britannica.com/EBchecked/topic/195201 http://www.sciencedirect.com/science/article/pii/S... http://www.stephenwolfram.com/publications/mathema... http://mathworld.wolfram.com/EulerAngles.html http://mathworld.wolfram.com/EulerBrick.html