DUBINSKY, E. D.; RAMANUJAN, M. S. Λ(α)-Bases and Nuclear Spaces. The Journal of the Indian Mathematical Society, [S. l.], v. 36, n. 3-4, p. 333–345, 1972. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/16676. Acesso em: 5 may. 2024.