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Design and Update of a Classification System: The UCSD Map of Science
Börner K,
Klavans R,
Patek M,
Zoss AM,
Biberstine JR,
et al.
(2012)
Design and Update of a Classification System: The UCSD Map of Science.
PLOS ONE 7(7): e39464.
https://doi.org/10.1371/journal.pone.0039464