ZarankiewiczDB,

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z(23,28) = 131

Given by the density principle on z(22,28).

upper bound = 131, submitted on April 25th, 2016 (link)

By deleting 8 rows and 3 columns from the finite projective plane of order 5.

lower bound = 131, submitted on April 24th, 2016 (link)

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