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取り合えず入手文献名を記すにとどめます。

• Michael Morris　　Routledge Philosophy GuideBook to Wittgenstein and the Tractatus, Routledge, Routledge Philosophy GuideBooks Series, 2008
• E.J. Lowe　　“Keynote Address: Recent Progress in Metaphysics,”　International Conference on Formal Ontology in Information Systems, October 17-19, 2001, Ogunquit, Maine