HARUKI, S.; NAKAGIRI, S.- ichi. Partial difference equations arising from the Cauchy-Riemann equations. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 5, p. 59–76, 2006. Disponível em: https://studmath.uken.krakow.pl/article/view/13293. Acesso em: 31 oct. 2026.