Feldhay, Rivka Department Ideals and Practices of Rationality, Max Planck Institute for the History of Science, Max Planck Society;
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/EB0F17172243A1B35509ABC26FAAE706/9781139000598c03_p80-145_CBO.pdf/use_and_abuse_of_mathematical_entities.pdf (全文テキスト（全般）)
Feldhay, R. (1998). The use and abuse of mathematical entities: Galileo and the Jesuits revisited. In P., Machamer (Ed.), The Cambridge Companion to Galileo (pp. 80-145). Cambridge: Cambridge University Press. doi:10.1017/CCOL0521581788.004.
