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2. English transl., J. Math. Sci., 120, No. 5, 1645-1652 (2004).
3. A. B. Aleksandrov, "Operator Lipschitz functions and linear fractional transformations," Zap. Nauchn. Semin. POMI, 401, 5-52 (2012)
4. English transl., J. Math. Sci., 194, No. 6, 603-627 (2013).
5. A. B. Aleksandrov and V. V. Peller, "Operator Lipschitz functions," Uspekhi Matem. Nauk, 71, No. 4, 3-106 (2016)