PRAKASHA, D.G.; NAGARAJA, H.G.; SOMASHEKHARA, G. ON (N (k), ξ)-SEMI-RIEMANNIAN 3-MANIFOLDS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 32, p. 115–124, 2014. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6229. Acesso em: 7 aug. 2026.