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→Twenty-first century articles: Update URL.
|issue=3
|pages=312-7
|url=https://wwwciteseerx.sciencedirectist.com/science/article/abs/piipsu.edu/S1571891307001100document?repid=rep1&type=pdf&doi=509b00cc1421e41f20160d3ed8e2f7ae2f7faf30
|archived=
|quote=