... Distance[*]
This work has been partially supported by the MCyT TIN2006-15265-C06-04 project, as well as by the BUAP-701 PROMEP/103.5/05/1536 grant
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... MEDLINE[*]
http://www.nlm.nih.gov/
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... (CERN)[*]
http://library.cern.ch
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