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Xin-Lei Feng and  Ting-Zhu Huang,  Some Results of Sign patterns Allowing Simultaneous Unitary Diagonalizability.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2011, vol. 56(8). 1252 - 1254[viewed 16 October 2018]. Available from: http://waset.org/publications/4177.