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  1. Leila Z. Puga, Newton C. A. da Costa & Roberto J. Vernengo (1991). Lógicas normativas, moral y derecho. Critica 23 (69):27 - 59.
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  2. Leila Z. Puga & Newton C. A. Da Costa (1988). On The Imaginary Logic of N. A. VASILIEV. Mathematical Logic Quarterly 34 (3):205-211.
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  3. Leila Z. Puga & Newton C. A. da Costa (1987). Sobre a lógica deôntica não-clássica. Critica 19 (55):19 - 37.
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  4. Leila Z. Puga & Newton Ca da Costa (1987). Logic with Deontic and Legal Modalities, Preliminary Account. Bulletin of the Section of Logic 16 (2):71-75.
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