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Jun 8, 2015 at 17:18 comment added Steven Pav References? Berberan Santos: web.ist.utl.pt/ist12219/data/115.pdf ; Leon: dx.doi.org/10.1007/s10910-010-9787-y ; Samuelson: projecteuclid.org/euclid.aoms/1177731459 hth,
Feb 9, 2012 at 22:31 history edited Jiahao Chen CC BY-SA 3.0
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Feb 9, 2012 at 22:22 history asked Jiahao Chen CC BY-SA 3.0