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Ling Zhang and  Ting-Zhu Huang,  Sign Pattern Matrices that Admit P0 Matrices.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2011, vol. 60(12). 1960 - 1963[viewed 21 July 2018]. Available from: http://waset.org/publications/11775.