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Aug 20, 2018 at 15:02 comment added Jose Brox @abx Thanks, this paper is nice. I'm still interested in locating the original one, but I will use your recommendation also.
Aug 20, 2018 at 14:44 comment added abx I do not know whether a digital copy exists, but you might be interested by a simpler proof due to Karen Chandler: Trans. Amer. Math. Soc. 353 (2001), 1907-1920.
Aug 20, 2018 at 14:20 history asked Jose Brox CC BY-SA 4.0