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Keith Devlin
Science, New Series, Vol. 298, No. 5600. (Dec. 6, 2002), pp. 1899-1900.
2.
John W. Dawson, Jr.
PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association, Vol. 1984, Volume Two: Symposia and Invited Papers. (1984), pp. 253-271.
3.
What the
Hugh Lacey; Geoffrey Joseph
Mind, New Series, Vol. 77, No. 305. (Jan., 1968), pp. 77-83
4.
David Wayne Thomas
PMLA, Vol. 110, No. 2. (Mar., 1995), pp. 248-261.
5.
John W. Dawson, Jr.; Cheryl A. Dawson
The Bulletin of Symbolic Logic, Vol. 11, No. 2. (Jun., 2005), pp. 150-171.