Solution to a Problem of Goranko and Passy

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\begin{bibtex} @article{DBLP:journals/logcom/Wolter94,

 author    = {Frank Wolter},
 title     = {Solution to a Problem of Goranko and Passy},
 journal   = {J. Log. Comput.},
 volume    = {4},
 number    = {1},
 year      = {1994},
 pages     = {21-22},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}