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Tretter, Christiane; Wyss, Christian (2014). Dichotomous Hamiltonians with unbounded entries and solutions of Riccati equations. Journal of evolution equations, 14(1), pp. 121-153. Birkhäuser 10.1007/s00028-013-0210-6
Jacob, Birgit; Trunk, Carsten; Winklmeier, Monika (2008). Analyticity and Riesz basis property of semigroups associated to damped vibrations. Journal of evolution equations, 8(2), pp. 263-281. Basel: Birkhäuser 10.1007/s00028-007-0351-6
