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Translated from Lietuvos Matematikos Rinkinys, Vol. 34, No. 2, pp. 248–254, April–June, 1994.
Translated by V. Mackevičius
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Norvidas, S. On the norm and numerical radius of Hermitian elements. Lith Math J 34, 201–204 (1994). https://doi.org/10.1007/BF02333417
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DOI: https://doi.org/10.1007/BF02333417