Sh:E56

Bib entry
@unpublished{Sh:E56,
 author = {Shelah, Saharon},
 title = {{Density is at most the spread of the square}},
 note = {\href{https://arxiv.org/abs/0708.1984}{arXiv: 0708.1984}},
 arxiv_number = {0708.1984}
}