ZABRODSKY, A. The Classification of Simply Connected $H$-Spaces with Three Cells I. MATHEMATICA SCANDINAVICA, [S. l.], v. 30, p. 193–210, 1972. DOI: 10.7146/math.scand.a-11075. Disponível em: https://tidsskrift.dk/math/article/view/11075. Acesso em: 14 aug. 2026.