The Dilogarithm Function of a Real Argument [S22] (Algorithm 490) CACM April, 1975 Ginsberg, E. S. Zaborowski, D. dilogarithm 5.12 CA750402 JB January 9, 1978 4:09 PM 2775 5 2775 2775 5 2775 2775 5 2775