Almeida, M. M., Mendonça, M. E., Sousinha, M., Martins, A. G., de Sousa, J. V. and Soares, J. (1991) “Application of aspiration cytology in the diagnosis of tumor lesions in children”., Acta Médica Portuguesa. Lisbon, Portugal, 4(2), pp. 71–5. doi: 10.20344/amp.3331.