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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
Freitas, Pedro; Hefti, Nicolas; Siegl, Petr (2020). The damped wave equation with singular damping. Proceedings of the American Mathematical Society, 148(10), pp. 4273-4284. American Mathematical Society 10.1090/proc/15063
