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URL: firstsearch.ocl ... http://firstsearch.oclc.org
URL: firstsearch.ocl ... http://firstsearch.oclc.org/journal=1040-7391;screen=info;ECOIP
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Wikipedia: en.wikipedia.or ... https://en.wikipedia.org/wiki/Differences_(journal)
Wikipedia: gl.wikipedia.or ... https://gl.wikipedia.org/wiki/Differences_(revista)
SUDOC: www.sudoc.fr/04 ... http://www.sudoc.fr/040255859
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Google: www.google.com/ ... https://www.google.com/search?q=ISSN+%221040-7391%22
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Pubmed: pubmed.ncbi.nlm ... https://pubmed.ncbi.nlm.nih.gov/?term=%221040-7391%22%5BJournal%5D&sort=
