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 and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. January 2010, vol. 37(1). 142 - 144 [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10461.