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Its numerical value is approximately 
- Robbins, David P.; Bolis, Theodore S. (1978), "Average distance between two points in a box (solution to elementary problem E2629)", American Mathematical Monthly, 85 (4): 277–278, doi:10.2307/2321177.
- Plouffe, Simon, "The Robbins constant", Miscellaneous Mathematical Constants, archived from the original on 2003-05-19
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