MarkinM. V. (2008). On scalar-type spectral operators and Carleman ultradifferentiable <i>C</i><sub>0</sub&gt;-semigroups. Ukrains’kyi Matematychnyi Zhurnal, 60(9), 1215 -. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3238