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References

Fred Sommers

(1996). Existence and correspondence-to-fact. In R. Poli, & P. Simons (Eds.). Formal ontology (pp. 131-158). Dordrecht: Springer.

(1974). The logical and the extra-logical. In R. S. Cohen, & M. W. Wartofsky (Eds.). Methodological and historical essays in the natural and social sciences (pp. 235-252). Dordrecht: Springer.