J.Bohr,<a href=“http://web.archive.org/web/20061003064200/http://ic.net/~jnbohr/java/拉马努詹.html“>Ramanujan的Pi近似方法</a>.
J.Borwein,<a href=“http://www.cecm.sfu.ca/organics/papers/borwein/paper/html/node15.html#SECTION000800000000000000“>Ramanujan的总和</a>.
R.Matsumoto,<a href=“http://babel.altavista.com/translate.dyn?url=http://www.pluto.ai.kyutech.ac.jp/plt/matumoto/pi_small/node26.html&;lp=ja_en“>Ramanujan型系列</a> . [断开的链接]
Eric W.Weisstein,<a href=“http://mathworld.wolfram.com/Octahedron.html“>八面体</a>.