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<div class="csl-entry">Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Brandstetter, J., Dragicevic, M., Erö, J., Escalante Del Valle, A., Flechl, M., Frühwirth, R., Jeitler, M., Krammer, N., Krätschmer, I., Liko, D., Madlener, T., Mikulec, I., Rad, N., Schieck, J., … Woods, N. (2019). Observation of Two Excited B+c States and Measurement of the B+c (2S) Mass in pp Collisions at √s = 13 TeV. <i>Physical Review Letters</i>, <i>122</i>(13), Article 132001. https://doi.org/10.1103/physrevlett.122.132001</div>
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