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@misc{Explore (UCL Library catalogue), url={http://www.ucl.ac.uk/library/explore/} }
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@misc{TRIP database, url={http://www.tripdatabase.com/search/advanced} }
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@misc{DuckDuckGo, url={https://duckduckgo.com/} }
@misc{Google, url={https://www.google.co.uk} }
@misc{Dogpile (Web Search), url={http://www.dogpile.com/} }
@misc{Phil Bradley: Which search engine when?, url={http://www.philb.com/whichengine.htm} }
