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On the Geometric Interpretation of the Nonnegative Rank
Gillis, N., & Glineur, F. (2012). On the Geometric Interpretation of the Nonnegative Rank. Linear Algebra and Its Applications, 437(11), 2685-2712. https://doi.org/10.1016/j.laa.2012.06.038 (Original work published 2012)