CIESLAK, W.; ZAJAC, J. The rosettes. MATHEMATICA SCANDINAVICA, [S. l.], v. 58, p. 114–118, 1986. DOI: 10.7146/math.scand.a-12133. Disponível em: https://www.mscand.dk/article/view/12133. Acesso em: 5 may. 2024.