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Ber-Lin Yu and  Ting-Zhu Huang,  Minimal Critical Sets of Inertias for Irreducible Zero-nonzero Patterns of Order 3.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2010, vol. 37(1). 127 - 129[viewed 21 September 2018]. Available from: http://waset.org/publications/11586.