Beukers, F. "A Note on the Irrationality of and ." Bull. London Math. Soc.11, 268-272, 1979.Borwein, J.; Bailey, D.; and Girgensohn, R. 数学实验:计算发现之路。 Wellesley, MA: A K Peters, 2004.Chapman, R. "A Proof of Hadjicostas's Conjecture." 15 Jun 2004. http://arxiv.org/abs/math/0405478.Guillera, J. and Sondow, J. "Double Integrals and Infinite Products for Some Classical Constants Via Analytic Continuations of Lerch's Transcendent." 16 June 2005 http://arxiv.org/abs/math.NT/0506319.Hadjicostas, P. "A Conjecture-Generalization of Sondow's Formula." 21 May 2004. http://www.arxiv.org/abs/math.NT/0405423/.Sloane, N. J. A. Sequences A094640, A103130 in "The On-Line Encyclopedia of Integer Sequences."Sondow, J. "Criteria for Irrationality of Euler's Constant." Proc. Amer. Math. Soc.131, 3335-3344, 2003. http://arxiv.org/abs/math.NT/0209070.Sondow, J. "Double Integrals for Euler's Constant and and an Analog of Hadjicostas's Formula." Amer. Math. Monthly112, 61-65, 2005.