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Why Do We Need Upper-Level Ontologies?
Upper and Lightweight Ontologies, What's the Difference?
Relationships between upper-level ontologies
Lecture 7 Towards a standard upper level ontology
What are ontologies and what can they be used for?
Top-Level Ontologies (2018)
On Useful Ontologies
Introduction to Basic Formal Ontology (BFO) 2012
ISO/IEC 21838 Top Level Ontologies (November 2021)
BFO Tutorial (2019). Part 5: BFO as Top-Level Ontology
Creating Ontologies that Work Together
Realizable Entities in Basic Formal Ontology
