Borchert, M.J.; Blessing, P.E.; Devlin, J.A.; Harrington, J.A. et al.: Measurement of Ultralow Heating Rates of a Single Antiproton in a Cryogenic Penning Trap. In: Physical Review Letters 122 (2019), Nr. 4, 43201. DOI:
https://doi.org/10.1103/PhysRevLett.122.043201