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I replaced http://wwwmath.uni-muenster.de/logik/Personen/burr/HA.ps with https://www.jstor.org/stable/2586698?seq=1 since the first link is no longer valid, and the second appears to be the same paper that was being referenced. Tuvok302 ( talk) 20:15, 18 November 2018 (UTC)
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I replaced http://wwwmath.uni-muenster.de/logik/Personen/burr/HA.ps with https://www.jstor.org/stable/2586698?seq=1 since the first link is no longer valid, and the second appears to be the same paper that was being referenced. Tuvok302 ( talk) 20:15, 18 November 2018 (UTC)