A Counterexample in Tense Logic

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\begin{bibtex} @article{DBLP:journals/ndjfl/Wolter96,

 author    = {Frank Wolter},
 title     = {A Counterexample in Tense Logic},
 journal   = {Notre Dame Journal of Formal Logic},
 volume    = {37},
 number    = {2},
 year      = {1996},
 pages     = {167-173},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}