BYSZEWSKI, L. Strong maximum principles for implicit parabolic functional-differential problems together with initial inequalities. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 4, p. 9–16, 2004. Disponível em: https://studmath.uken.krakow.pl/article/view/13304. Acesso em: 31 oct. 2026.