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Engström, Christian; Torshage, Johan Axel (2018). Accumulation of complex eigenvalues of a class of analytic operator functions. Journal of functional analysis, 275(2), pp. 442-477. Elsevier 10.1016/j.jfa.2018.03.019
Engström, Christian; Torshage, Johan Axel (2017). On equivalence and linearization of operator matrix functions with unbounded entries. Integral equations and operator theory, 89(4), pp. 465-492. Birkhäuser 10.1007/s00020-017-2415-5
Engström, Christian; Torshage, Johan Axel (2017). Enclosure of the numerical range of a class of non-selfadjoint rational operator functions. Integral equations and operator theory, 88(2), pp. 151-184. Birkhäuser 10.1007/s00020-017-2378-6
