Interior points of the completely positive cone.
Dür, Mirjam and Still, Georg (2008) Interior points of the completely positive cone. Electronic Journal of Linear Algebra, 17 . pp. 4853. ISSN 10813810

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Abstract:  A matrix A is called completely positive if it can be decomposed as A = BB^T with an entrywise nonnegative matrix B. The set of all such matrices is a convex cone. We provide a characterization of the interior of this cone as well as of its dual. 
Item Type:  Article 
Faculty:  Electrical Engineering, Mathematics and Computer Science (EEMCS) 
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Official URL:  http://www.math.technion.ac.il/iic/ela/elaarticles/articles/vol17_pp4853.pdf 
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