- J. Huang, F. Sukochev, “Operator
$\theta $ -Hölder functions”, Banach J. Math. Anal., 14, № 3, 2020,607 
- Alexander Pushnitski, “Spectral Theory of Discontinuous Functions of Self-Adjoint Operators: Essential Spectrum”, Integr. Equ. Oper. Theory, 68, № 1, 2010,
75 - Denis Potapov, Fedor Sukochev, “Operator-Lipschitz functions in Schatten–von Neumann classes”, Acta Math., 207, № 2, 2011,
375