MUKHIGULASHVILI, Sulkhan. Some two-point boundary value problems for systems of higher order functional differential equations. Mathematica Scandinavica, Berkeley, CA, United States, v. 127, n. 2, p. 382–404, 2021. DOI: 10.7146/math.scand.a-126021. Disponível em: https://journals.msp.org/mscand/article/view/150. Acesso em: 24 jul. 2026.