AL-SALAM, W. A. Note on a $q$-identity. MATHEMATICA SCANDINAVICA, [S. l.], v. 5, p. 202–204, 1957. DOI: 10.7146/math.scand.a-10495. Disponível em: https://www.mscand.dk/article/view/10495. Acesso em: 2 may. 2024.