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R. Roman Witula, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL13/Witula2/witula40r.html">Ramanujan Cubic Polynomials of the Second Kind</a>, J. Int. Seq. 13 (2010) # 10.7.5, eq. (1).
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Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/sqrt_base">Index of expansions of sqrt(d) in base b</a>.
D. Merrill, <a href="http://www.netcom.com/~merrills/sqrt51000000.txt">First million digits of square root of 5</a>. [Broken link]
Robert Nemiroff and Jerry Bonnell, <a href="http://antwrp.gsfc.nasa.gov/htmltest/gifcity/sqrt5.1mil">The first 1 million digits of the square root of 5</a>.
Robert Nemiroff and Jerry Bonnell, Plouffe's Inverter, <a href="http://www.plouffe.fr/simon/constants/sqrt5.txt">The first 1 million digits of the square root of 5</a>.
Clifford A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," <a href="http://www.zentralblatt-math.org/zmath/en/advanced/?q=an:0983.00008&format=complete">Zentralblatt review</a>.
<a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>.
David Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, Revised edition 1987. See p. 45.
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Equals Product_{k>=0} ((10*k + 2)(10*k + 4)(10*k + 6)(10*k + 8))/((10*k + 1)*(10*k + 3)*(10*k + 7)*(10*k + 9)).
(10*k + 3)*(10*k + 7)*(10*k + 9)).
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