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| ___location = Denver, Colorado, United States
| pages = 187–192
| doi = 10.1145/800152.804913| doi-access= free
}}</ref> It was improved to its current form via a complex proof by Joel Seiferas, [[Michael J. Fischer|Michael Fischer]], and [[Albert R. Meyer|Albert Meyer]] in 1978.<ref>{{cite journal | last1 = Seiferas
| first1 = Joel I.
|