ROTER, W. On a class Riemannian manifolds with harmonic Weyl conformal curvature tensor. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 4, p. 191–202, 2004. Disponível em: https://studmath.uken.krakow.pl/article/view/13318. Acesso em: 31 oct. 2026.