MALM, K. Prespectra and towers over model categories. Annales Fennici Mathematici, [S. l.], v. 12, n. 2, p. 269–277, 1987. DOI: 10.5186/aasfm.1987.1221. Disponível em: https://afm.journal.fi/article/view/134602. Acesso em: 25 nov. 2024.