YAMAGUCHI, Hiroshi. An extension of a theorem of F. Forelli. MATHEMATICA SCANDINAVICA, [S. l.], v. 52, p. 145–160, 1983. DOI: 10.7146/math.scand.a-12000. Disponível em: https://tidsskrift.dk/math/article/view/12000. Acesso em: 14 aug. 2026.