EngeH. A.: Achromatic magnetic mirror for ion beams. Rev. sci. Instr.34 (1963), 385.
2.
VICKERS REPORT: A pretzel magnet for wide range spectrum analysis of electron beams up to 35 MeV. Vickers Limited, Radiation and Nuclear Engineering Division, South Marston Works, Swindon, England. Personal communication, 1970.
