Nicola Guarino. The Ontological Level: Revisiting 30 Years of Knowledge Representation. In Alexander Borgida, Vinay K. Chaudhri, Paolo Giorgini, Eric S. K. Yu, editors, Conceptual Modeling: Foundations and Applications - Essays in Honor of John Mylopoulos. Volume 5600 of Lecture Notes in Computer Science, pages 52-67, Springer, 2009. [doi]
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