A Conceptual Model for Time

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\begin{bibtex} @article{DBLP:tr/ibm/LILOG2,

 author    = {Rudi Studer},
 title     = {A Conceptual Model for Time},
 journal   = {LILOG-Report},
 publisher = {IBM Deutschland GmbH},
 volume    = {2},
 year      = {1986},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}