“A classification of linear operators with minimal polinomial $f(t) = (t-a)(t-b)$, $a \neq b$, acting in a filtered vector space” (2000) Neliniini Kolyvannya, 3(1), pp. 31–35. Available at: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/92 (Accessed: 22 January 2026).