On inequalities for hypergeometric analogues of the arithmetic-geometric mean. Barnard, Roger W.; Richards, Kendall C. — 2007 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
An isoperimetric inequality for logarithmic capacity. Barnard, Roger W.; Pearce, Kent; Solynin, Alexander Yu. — 2002 Annales Academiae Scientiarum Fennicae. Mathematica