PERSSON, Jan. A Boundary Problem for Analytic Linear Systems with Data on Intersecting Hyperplanes. MATHEMATICA SCANDINAVICA, [S. l.], v. 14, p. 106–110, 1964. DOI: 10.7146/math.scand.a-10710. Disponível em: https://tidsskrift.dk/math/article/view/10710. Acesso em: 14 aug. 2026.