Pencil beam characteristics of the next-generation proton scanning gantry of PSI: design issues and initial commissioning resultsE. Pedroni, D. Meer, C. Bula, S. Safai and S. ZenklusenEur. Phys. J. Plus, 126 7 (2011) 66DOI: https://doi.org/10.1140/epjp/i2011-11066-0