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Ber-Lin Yu and  Ting-Zhu Huang,  A Note on the Minimum Cardinality of Critical Sets of Inertias for Irreducible Zero-nonzero Patterns of Order 4.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2010, vol. 37(1). 142 - 144[viewed 20 October 2018]. Available from: http://waset.org/publications/10461.