# Article

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References:
[1] P. J. Bushell: On solutions of the matrix equation $T\sp{\prime} AT=A\sp{2}$. Linear Algebra and its Appl. 8 (1974), pp. 465-469. MR 0364296
[2] G. K. Pedersen: C*-Algebras and Their Automorphism Groups. Academic Press, London 1979. MR 0548006 | Zbl 0416.46043

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