Gubreev, G.M., Dolgopolova, M.V. and Nedobachiy, S.I. (2010) “A spectral decomposition in one class of non-selfadjoint operators”, Methods of Functional Analysis and Topology, 16(2), pp. 140–157. Available at: https://zen.imath.kiev.ua/index.php/mfat/article/view/447 (Accessed: 16 December 2025).