KRIŠČIŪNAITĖ, A. The almost contract structures on hypersurfaces in four-dimensional centred biaffined space of elliptic and hyperbolic type. Lithuanian Mathematical Journal, [S. l.], v. 7, n. 3, p. 423–438, 1967. DOI: 10.15388/LMJ.1967.19985. Disponível em: https://www.journals.vu.lt/LMJ/article/view/19985.. Acesso em: 7 may. 2024.