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MR2376207 15A24 (46L54 47A56 60E05)
Helton, J. William; Rashidi Far, Reza; Speicher, Roland Operator-valued semicircular elements: solving a quadratic matrix equation with positivity constraints. Int. Math. Res. Not. IMRN 2007, no. 22, Art. ID rnm086, 15 pp.
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