- Paradoxin des Unendlichen by Bernhard Bolzanos,  2006-11-30
 - PRECURSORS OF MODERN LOGIC: BOLZANO: An entry from Gale's <i>Encyclopedia of Philosophy</i> by Yehoshua Bar-Hillel,  2006
 - BOLZANO, BERNARD(17811848): An entry from Gale's <i>Encyclopedia of Philosophy</i> by Yehoshua Bar-Hillel,  2006
 - Journal of the History of Philosophy: Vol. 45, No. 4, October 2007.(PHILOSOPHICAL ABSTRACTS): An article from: The Review of Metaphysics by Gale Reference Team,  2007-09-01
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