@incollection{Ketner1989,
author = "Kenenth L. Ketner",
title = "{Hartshorne and the Basis of Peirce's Categories}",
booktitle = "{Hartshorne: Process Philosophy and Theology}",
editor = "Robert Kane and Stephen H. Phillips",
year = 1989,
address = "Albany",
publisher = "State University of New York Press",
pages = "135-149",
keywords = "Categories, Cenopythagorean Categories, Non-reduction Theorem",
language = "English",
note = "From the Commens Bibliography | \url{http://www.commens.org/bibliography/collection_article/ketner-kenenth-l-1989-hartshorne-and-basis-peirces-categories}"
}