George, S., Blaum, K., Block, M., Breitenfeldt, M., Dworschak, M., Herfurth, F., Herlert, A., Kowalska, M., Minaya Ramirez, E., Kretzschmar, M., Neidherr, D., Schwarz, S., & Schweikhard, L. (2011). Damping effects in Penning trap mass spectrometry. International Journal of Mass Spectrometry, 299, 102-112. doi:10.1016/j.ijms.2010.09.030.