MUKHIGULASHVILI, S. Some two-point boundary value problems for systems of higher order functional differential equations. MATHEMATICA SCANDINAVICA, [S. l.], v. 127, n. 2, p. 382–404, 2021. DOI: 10.7146/math.scand.a-126021. Disponível em: https://www.mscand.dk/article/view/126021. Acesso em: 22 sep. 2021.