Teoria de modelo abstrato (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Teoria de modelo abstrato" in Portuguese language version.

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Institution-independent model theory by Răzvan Diaconescu 2008 ISBN 3-7643-8707-6 page 3
Handbook of mathematical logic by Jon Barwise 1989 ISBN 0-444-86388-5 page 45
Jean-Yves Béziau Logica universalis: towards a general theory of logic 2005 ISBN 978-3-7643-7259-0 pages 20–25