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    • The nonnegative P_0-matrix completion problem 

      Kivunge, B.; Ji Young Choi; Luz Maria DeAlba; Leslie Hogben; Sandra K. Nordstrom; Mike Shedenhelm (International Linear Algebra Society, 2014)
      In this paperthe nonnegative P0-matrix completion problem is considered. It is shown that a pattern for 4 × 4 matrices that includes all diagonal positions has nonnegative P0- completion if and only if its digraph is ...