Sh:E68

Bib entry
@unpublished{Sh:E68,
 author = {Shelah, Saharon},
 title = {{Inner product space with no ortho-normal basis without choice}},
 note = {\href{https://arxiv.org/abs/1009.1441}{arXiv: 1009.1441}},
 arxiv_number = {1009.1441}
}