SADYKOV, T. M. On the Horn system of partial differential equations and series of hypergeometric type. MATHEMATICA SCANDINAVICA, [S. l.], v. 91, n. 1, p. 127–149, 2002. DOI: 10.7146/math.scand.a-14382. Disponível em: https://tidsskrift.dk/math/article/view/14382. Acesso em: 14 aug. 2026.