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<ref name="Powell2008-18">{{cite book |last=Powell |first=Mark |title=Deco for Divers |publisher=Aquapress |___location=Southend-on-Sea |year=2008 |page=18 |isbn=978-1-905492-07-7}}</ref>
<ref name="Pressure94">{{cite journal |last1=Völlm |first1=T.G
<ref name="Shields">{{cite
Diving Operations on the U.K. Continental Shelf During 1982 to 1988|
<ref name="spums1999">{{cite journal |last1=Wendling |first1=J |last2=Nussberger |first2=P |last3=Schenk |first3=B |title=Milestones of the deep diving research laboratory Zurich |journal=South Pacific Underwater Medicine Society Journal |volume=29 |issue=2 |year=1999 |issn=0813-1988 |oclc=16986801 |url=http://archive.rubicon-foundation.org/6003 |access-date=2009-04-02 |archive-url=https://web.archive.org/web/20120203155311/http://archive.rubicon-foundation.org/xmlui/handle/123456789/6003 |archive-date=2012-02-03 |url-status=usurped }}</ref>
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