Chakravarty, S. R., M. Mitra, S. Mutuswami, and R. Pal. “A Vote-Share Concentration-Based Axiomatic Characterisation of the Probability-Ratio Index of Electoral Competition”. Journal of Income Distribution®, vol. 31, no. 3-4, Oct. 2022, doi:10.25071/1874-6322.40549.