Militzer, Erin
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Numerical ranges of 4-by-4 nilpotent matrices 

, In: Large truncated Toeplitz matrices, Toeplitz operators, and related topics / edited by Dario A. Bini, Torsten Ehrhardt, Alexei Yu. Karlovich, Ilya Spitkovsky
flat portions on the boundary 
Copies:  Zentrale:E02 a mat 464/430-259
 
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