Yun, Zhang, "Euler's Inequality Revisited", Mathematical Spectrum, Volume 40, Number 3 (May 2008), pp. 119-121. First page available at "نسخة مؤرشفة"(PDF). مؤرشف من الأصل(PDF) في 2016-03-04. اطلع عليه بتاريخ 2021-12-08..
Shattuck, Mark, “A Geometric Inequality for Cyclic Quadrilaterals”, Forum Geometricorum 18, 2018, 141-154. http://forumgeom.fau.edu/FG2018volume18/FG201822.pdf This paper also gives various inequalities in terms of the arc lengths subtended by a cyclic quadrilateral’s sides. نسخة محفوظة 2018-09-13 على موقع واي باك مشين.
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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 "نسخة مؤرشفة"(PDF). مؤرشف من الأصل(PDF) في 2016-03-04. اطلع عليه بتاريخ 2021-12-08..
Shattuck, Mark, “A Geometric Inequality for Cyclic Quadrilaterals”, Forum Geometricorum 18, 2018, 141-154. http://forumgeom.fau.edu/FG2018volume18/FG201822.pdf This paper also gives various inequalities in terms of the arc lengths subtended by a cyclic quadrilateral’s sides. نسخة محفوظة 2018-09-13 على موقع واي باك مشين.