Developments in heavy quarkonium spectroscopy
  We summarize recent developments in heavy quarkonium spectroscopy, relying on previous review articles for the bulk of material available prior to mid-2010. This note is intended as a mini-review to appear in the 2012 Review of Particle Physics published by the Particle Data Group. 
S. Eidelman, B. K. Heltsley, J. J. Hernandez-Rey, S. Navas, and C.   Patrignani
hep-ex hep-lat hep-ph