POVSTENKO, J. Fractional calculus and diffusive stress. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 6, p. 95–100, 2007. Disponível em: https://studmath.uken.krakow.pl/article/view/13283. Acesso em: 30 oct. 2026.