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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>T. Bohringer et al. (CUSB Collaboration) (1980). "Observation of ϒ, ϒ′, and ϒ′′ at the Cornell Electron Storage Ring". Physical Review Letters. 44 (17): 1111–1114. Bibcode:1980PhRvL..44.1111B. doi:10.1103/PhysRevLett.44.1111. <a href="/wiki/Physical_Review_Letters" target="_blank">/wiki/Physical_Review_Letters</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>G. Finocchiaro et al. (CUSB Collaboration) (1980). "Observation of the ϒ′′′ at the Cornell Electron Storage Ring". Physical Review Letters. 45 (4): 222–225. Bibcode:1980PhRvL..45..222F. doi:10.1103/PhysRevLett.45.222. <a href="/wiki/Physical_Review_Letters" target="_blank">/wiki/Physical_Review_Letters</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>