CUADRADO, Mariano. Wing length criteria for sex determination of Robins Erithacus rubecula wintering in southern Spain. Ornis Svecica, Lund, Sweden, v. 1, n. 1, p. 55–57, 1991. DOI: 10.34080/os.v1.23098. Disponível em: https://journals.lub.lu.se/os/article/view/23098. Acesso em: 20 apr. 2024.