NYBERG, K. Splitting twisted sums of nuclear Köthe spaces. Annales Fennici Mathematici, [S. l.], v. 11, n. 2, p. 233–237, 1986. DOI: 10.5186/aasfm.1986.1115. Disponível em: https://afm.journal.fi/article/view/134574. Acesso em: 25 nov. 2024.