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Dyfyniad Arddull ChicagoLigozat, Gérard. Qualitative Spatial and Temporal Reasoning. London, U.K. : Hoboken, N.J.: ISTE ; Wiley, 2012.
Dyfyniad MLALigozat, Gérard. Qualitative Spatial and Temporal Reasoning. ISTE ; Wiley, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.