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2. I. B. Simonenko, Local Method in the Theory of Invariants Relative to Shift of Operators and Their Envelope Curves [in Russian], Rostov-on-Don (2007).
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5. R. Willett, “An index theorem for band-dominated operators with slowly oscillating coefficients (after Deundyak and Shteinberg),” Int. Equ. Oper. Theor. 69, 301–316 (2011).