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Hefti, Nicolas; Tretter, Christiane (2022). Essential numerical range and C-numerical range for unbounded operators. Studia mathematica, 264(3), pp. 305-333. Polish Academy of Sciences 10.4064/sm201231-16-9
Aalto, Daniel; Berkovits, Lauri; Kansanen, Outi Elina; Yue, Hong (2011). John-Nirenberg lemmas for a doubling measure. Studia mathematica, 204(1), pp. 21-37. Lwów: Instytut Matematyczny PAN 10.4064/sm204-1-2