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* {{cite journal|ref=harv|first1=Vladimir|last1=Estivill-Castro|first2=Derick|last2=Wood|author2-link=Derick Wood|title=A new measure of presortedness|journal=Information and Computation|volume=83|issue=1|pages=111–119|year=1989|doi=10.1016/0890-5401(89)90050-3|doi-access=free}}
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* {{cite journal|first=Steven S.|last=Skiena|year=1988|title=Encroaching lists as a measure of presortedness|journal=BIT|volume=28|issue=4|pages=755–784|doi=10.1007/bf01954897}}