@techreport{16CKMSW-NMFIrrational16,
title = "Nonnegative Matrix Factorization Requires Irrationality",
author = "Dmitry Chistikov and Stefan Kiefer and Ines Maru\v{s}i\'{c} and Mahsa Shirmohammadi and James Worrell",
year = "2016",
institution = "arxiv.org",
note = "To appear in SIAM Journal on Applied Algebra and Geometry; available at \verb|http://arxiv.org/abs/1605.06848|",
}