Werf, D. v. d., Fajans, J., Bertsche, W., Burke, K., Chapman, S., & Werf, D. v. d. (2005). Effects of Extreme Magnetic Quadrupole Fields on Penning Traps and the Consequences for Antihydrogen Trapping. Physical Review Letters, 95(15), . doi:10.1103/PhysRevLett.95.155001

Werf, Dirk van der, J. Fajans, W. Bertsche, K. Burke, S. Chapman, and D. van der Werf. "Effects of Extreme Magnetic Quadrupole Fields On Penning Traps and the Consequences for Antihydrogen Trapping." Physical Review Letters 95, no. 15 (2005).

Werf, Dirk van der, et al. "Effects of Extreme Magnetic Quadrupole Fields On Penning Traps and the Consequences for Antihydrogen Trapping." Physical Review Letters 95.15 (2005).