1. Means and their iterations;Arazy,1985
2. Über das arithmetisch-geometrische Mittel aus vier Elementen;Borchardt,1888
3. Pi and the AGM—A Study in Analytic Number Theory and Computational Complexity;Borwein,1987
4. The way of all means;Borwein;MAA Monthly,1987
5. On the mean iteration (a, b) ← ((a + 3b)4, ((√ab + b)2);Borwein;Math. Comp.,1989