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Benthan and Vaihinger
http://www.buildfreedom.com/language/bentham.html
An introduction to the important works of Bentham and Vaihinger.
Hans Vaihinger's Kant-Studien
http://www.kant.uni-mainz.de/ks/history/adair-toteff.html
Commentary on Hans Vaihinger's philosophical activity by Christopher Adair-Toteff