Marques, J A, V de Macedo, M Coelho, J Cabral, L P de Castro, A A Vaz, L G Pinheiro, and J Alves. 1989. “Inter- and Intra-Observer Variation in Silicosis Radiology”. Acta Médica Portuguesa 2 (6). Lisbon, Portugal:253-6. https://doi.org/10.20344/amp.3501.