POVSTENKO, J. Non-Riemannian geometry and the theory of lattice imperfections. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 3, p. 197–200, 2003. Disponível em: https://studmath.uken.krakow.pl/article/view/13488. Acesso em: 30 oct. 2026.