1. R. A. Horn and C. R. Johnson, Matrix Analysis (Cambridge University Press, Cambridge, 1985; Mir, Moscow, 1989).
2. C. Pearcy, “A complete set of unitary invariants for operators generating finite W*-algebras of type I,” Pacific J. Math. 12, 1405–1416 (1962).
3. A. George and Kh. D. Ikramov, “Unitary similarity of matrices with quadratic minimal polynomials,” Linear Algebra Appl. 349(1–3), 11–16 (2002).
4. Yu. A. Al’pin and Kh. D. Ikramov, ““On unitary similarity of algebras generated by pairs of orthoprojectors,” in Numerical Methods and Problems of Computation Organization. XVIII, Zap. Nauchn. Sem. POMI (POMI, St. Petersburg, 2005), Vol. 323, pp. 5–14 [J. Math. Sci. (N. Y.) 127 (3), 1957–1961 (2005)].
5. F. Kittaneh, “On the structure of polynomially normal operators,” Bull. Austral. Math. Soc. 30(1), 11–18 (1984).