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Basu, Sanjib; Dasgupta, Anirban (1997). "The mean, median, and mode of unimodal distributions: a characterization". Theory of Probability & Its Applications. 41 (2): 210–223. doi:10.1137/S0040585X97975447.
Morrison, Kent (1998-07-23). "Random Walks with Decreasing Steps"(PDF). Department of Mathematics, California Polytechnic State University. Archived from the original(PDF) on 2015-12-02. Retrieved 2007-02-16.