StorozhO. G., and ShuvarO. B. “Conditions for the Maximal Dissipativity of Almost Bounded Perturbations of Smooth Restrictions of Operators Adjoint to Symmetric Ones”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 56, no. 7, July 2004, pp. 966–976, https://umj.imath.kiev.ua/index.php/umj/article/view/3813.