Article (boerner2012design)
Börner, K.; Klavans, R.; Patek, M.; Zoss, A. M.; Biberstine, J. R.; Light, R. P.; Larivière, V. & Boyack, K. W.
Design and Update of a Classification System: The UCSD Map of Science
PLoS ONE, Public Library of Science, 2012, 7, e39464

Article (larowe2009scholarly)
La Rowe, G.; Ambre, S.; Burgoon, J.; Ke, W. & Börner, K.
The Scholarly Database and its utility for scientometrics research
Scientometrics, Springer Netherlands, 2009, 79, 219-234