ARLINSKY, Yu. M. Maximal sectorial extensions and closed forms associated with them. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 6, p. 723–738, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5273. Acesso em: 7 apr. 2025.