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References
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This article was written at the Department of Mathematics, Royal Institute of Technology, Stockholm, while the author was holding a scholarship from the State Council for Technical Research.
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Asplund, E. Metric criteria of normality for complex matrices of order less than 5. Ark. Mat. 3, 441–447 (1958). https://doi.org/10.1007/BF02589498
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DOI: https://doi.org/10.1007/BF02589498