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This Article:

Kevin W. Boyack
Mapping knowledge domains: Characterizing PNAS
PNAS 2004 101: 5192-5199.

has been cited by the following articles in journals that are participating in CrossRef's forward linking service:

Active Research Fields in Anesthesia: A Document Co-Citation Analysis of the Anesthetic Literature
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Anesthesia & Analgesia (2008) 106: 1524
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Visualizing the scientific world and its evolution
I. Samoylenko, T.-C. Chao, W.-C. Liu, and C.-M. Chen
Journal of the American Society for Information Science and Technology (2006) 57: 1461
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