Subalgebras of Cohen algebras need not be Cohen. Koppelberg, S. & Shelah, S. In Logic: from Foundations to Applications, of Oxford Science Publications, pages 261–275. Clarendon Press, Oxford, 1996. arxiv:math/9610227
bibtex   
@incollection{KpSh:504,
author = {Koppelberg, Sabine and Shelah, Saharon},
booktitle = {Logic: from Foundations to Applications},
fromwhere = {D,IL},
note = { arxiv:math/9610227 },
pages = {261--275},
publisher = {Clarendon Press, Oxford},
series = {Oxford Science Publications},
title = {{Subalgebras of Cohen algebras need not be Cohen}},
year = {1996},
}

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