LEMLEIN, V. G. Local center-projective spaces and connectivities of a differentiable manifold. Lithuanian Mathematical Journal, [S. l.], v. 4, n. 1, p. 41–132, 1964. DOI: 10.15388/LMJ.1964.19483. Disponível em: https://www.journals.vu.lt/LMJ/article/view/19483.. Acesso em: 27 sep. 2024.