Buchholz, Ralph H.; MacDougall, James A. (2008). Cyclic polygons with rational sides and area (англ) . Journal of Number Theory. с. 128: 17–48. doi:10.1016/j.jnt.2007.05.005. MR2382768.
Robbins, D. P. (1995). Areas of Polygons Inscribed in a Circle. The American Mathematical Monthly. 102 (6): 523—530. doi:10.2307/2974766. JSTOR2974766.
Buchholz, Ralph H.; MacDougall, James A. (2008). Cyclic polygons with rational sides and area (англ) . Journal of Number Theory. с. 128: 17–48. doi:10.1016/j.jnt.2007.05.005. MR2382768.
Robbins, D. P. (1995). Areas of Polygons Inscribed in a Circle. The American Mathematical Monthly. 102 (6): 523—530. doi:10.2307/2974766. JSTOR2974766.