RABANOVYCH, V. I. On the Decomposition of a Diagonal Operator into a Linear Combination of Idempotents or Projectors. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 3, p. 388–393, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3606. Acesso em: 6 dec. 2025.