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2. Level Confusions in Epistemology;Alston;Midwest Studies in Philosophy V: Epistemology,1980
3. Defeaters and Higher-Level Requirements;Bergmann;The Philosophical Quarterly,2005
4. Carlson , Robert W. 1998 Supplemental Oxygen for the General Aviation Pilot (What you don't know might kill you) http://www.dr-amy.com/rich/oxygen/
5. Does Murphy's Law Apply in Epistemology? Self-Doubt and Rational Ideals;Christensen;Oxford Studies in Epistemology,2007