Add a literature reference for the formula.

diff --git a/src/float/transcendental/cl_LF_zeta3.cc b/src/float/transcendental/cl_LF_zeta3.cc
index d578dc553c4418df7801d5aa699b730ce80d6117..980eec2254847497bdadcb2906aef7c2b4d8afa4 100644 (file)
--- a/src/float/transcendental/cl_LF_zeta3.cc
+++ b/src/float/transcendental/cl_LF_zeta3.cc
@@ -29,9 +29,9 @@ const cl_LF zeta3 (uintC len)
        //            \ n = 1                                    /
        //
        // The formula used to compute Zeta(3) has reference in the paper
-       // "Acceleration of Hypergeometric Series via the WZ method" by
-       // T. Amdeberhan and Doron Zeilberger, to appear in the Electronic
-       // Journal of Combinatorics [Wilf Festschrift Volume].
+       // "Hypergeometric Series Acceleration via the WZ method" by
+       // T. Amdeberhan and Doron Zeilberger,
+       // Electronic J. Combin. 4 (1997), R3.
        //
        // Computation of the sum:
        // Evaluate a sum(0 <= n < N, a(n)/b(n) * (p(0)...p(n))/(q(0)...q(n)))