FJELDSTAD, J. E. An Equation of Finite Differences, which has Some Connection with the Jacobian Thetafunctions. MATHEMATICA SCANDINAVICA, [S. l.], v. 22, p. 81–86, 1968. DOI: 10.7146/math.scand.a-10873. Disponível em: https://www.mscand.dk/article/view/10873. Acesso em: 3 may. 2024.