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AmirOnWiki (talk | contribs) Precise statement of the theorem |
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| issn = 0004-5411
| doi = 10.1145/322047.322061| s2cid = 13561149
| doi-access= free
}}</ref> Finally in 1983, Stanislav Žák achieved the same result with the simple proof taught today.<ref>{{cite journal
| first1 = Stanislav
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