1. Beaney M., (2003), ‘Analysis’. in Edward N. Zalta (ed.), The Stanford Encyclopedia of Philosophy (Summer 2003 Edition), URL=http://plato.stanford.edu/archives/sum2003/entries/analysis/.
2. Bolzano B., (1851), Paradoxien des Unendlichen; Leipzig. Partial English translation from “Paradoxes of the Infinite” by Donald Stell; in: Ewald 1996, pp. 249–292.
3. Ein Beitrag zur Mannigfaltigkeitslehre.