Yun, Zhang, "Euler's Inequality Revisited", Mathematical Spectrum, Volume 40, Number 3 (May 2008), pp. 119-121. First page available at "Arşivlenmiş kopya"(PDF). 4 Mart 2016 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 4 Aralık 2020..
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Icons of Mathematics. An exploration of twenty key images. Mathematical Association of America. 2011. ss. 125-126. ISBN978-0-88385-352-8.
Shattuck, Mark, “A Geometric Inequality for Cyclic Quadrilaterals”, Forum Geometricorum 18, 2018, 141-154. http://forumgeom.fau.edu/FG2018volume18/FG201822.pdf 13 Eylül 2018 tarihinde Wayback Machine sitesinde arşivlendi. This paper also gives various inequalities in terms of the arc lengths subtended by a cyclic quadrilateral’s sides.
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Yun, Zhang, "Euler's Inequality Revisited", Mathematical Spectrum, Volume 40, Number 3 (May 2008), pp. 119-121. First page available at "Arşivlenmiş kopya"(PDF). 4 Mart 2016 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 4 Aralık 2020..
Shattuck, Mark, “A Geometric Inequality for Cyclic Quadrilaterals”, Forum Geometricorum 18, 2018, 141-154. http://forumgeom.fau.edu/FG2018volume18/FG201822.pdf 13 Eylül 2018 tarihinde Wayback Machine sitesinde arşivlendi. This paper also gives various inequalities in terms of the arc lengths subtended by a cyclic quadrilateral’s sides.