|  | A. T. Young, P. Chen, W. B. Kunkel, K. N. Leung, C. Y. Li, and J. Watson, “Quantum Yield Measurements of Photocathodes Illuminated by Pulsed Ultraviolet Laser Radiation”, in Proc. 14th Particle Accelerator Conf. (PAC'91), San Francisco, CA, USA, May 1991, pp. 1993-1996. | 
            
            |  | G. J. DeVries et al., “Recent Development of RF-driven Multicusp H- Ion Sources”, in Proc. 5th European Particle Accelerator Conf. (EPAC'96), Sitges, Spain, Jun. 1996, paper THP070L, pp. 1513-1515. | 
            
            |  | M. Sarstedt et al., “Energy Spread of Ion Beams Generated in Multicusp Ion Sources”, in Proc. 16th Particle Accelerator Conf. (PAC'95), Dallas, TX, USA, May 1995, paper TPB07, pp. 2542-2544. | 
            
            |  | R. P. Wells et al., “Development of a Compact Permanent Magnet Cyclotron for Accelerator Mass Spectrometry”, in Proc. 15th Particle Accelerator Conf. (PAC'93), Washington D.C., USA, Mar. 1993, pp. 1727-1730. |