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  • Thumbnail for Zygmunt Ziembiński
    Ziembiński, Zygmunt (1976). Practical Logic. Springer Netherlands. ISBN 978-94-017-5589-4. Grabowski, Andrzej (June 24, 2013). Juristic Concept of the Validity...
    8 KB (724 words) - 21:35, 25 August 2024