@article{article, title  = {{Preface.}},

 publisher = {{Elsevier}},

 url = {{https://www.sciencedirect.com/journal/electronic-notes-in-theoretical-computer-science/vol/137/issue/2 }},

 year = {{2009}},

 month = {{12}},

 author = {{Derrick J and Boiten EA}},

 volume = {{137}},

 journal = {{REFINE}},

 pages = {{1-3}},

 note = {{Accessed on 2025/11/27}}}