There are Jonsson algebras in many inaccessible cardinals. Shelah, S. In Cardinal Arithmetic, volume 29, of Oxford Logic Guides. Oxford University Press, 1994. bibtex @incollection{Sh:365,
author = {Shelah, Saharon},
booktitle = {Cardinal Arithmetic}, refers_to = {g}, refers_text = {Ch.
III of}, public_list = {partof},
fromwhere = {IL},
publisher = {Oxford University Press},
series = {Oxford Logic Guides},
title = {{There are Jonsson algebras in many inaccessible cardinals}},
volume = {29}, general_editor = {General Editors: Dov M. Gabbay, Angus
Macintyre, Dana Scott},
year = {1994},
}