What is the upper part of the lattice of bimodal logics?
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\begin{bibtex} @article{DBLP:journals/sLogica/Wolter94,
author = {Frank Wolter},
title = {What is the upper part of the lattice of bimodal logics?},
journal = {Studia Logica},
volume = {53},
number = {2},
year = {1994},
pages = {235-242},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
\end{bibtex}
