Povstenko, J. (2003) “Non-Riemannian geometry and the theory of lattice imperfections”, Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, 3, pp. 197–200. Available at: https://studmath.uken.krakow.pl/article/view/13488 (Accessed: 30 October 2026).