1. T. Westermark, A double focusing magnetic spectrometer for studies of energy losses in matter of electrons from a 5 MeV betatron, Nucl. Instr. and Meth. (to be published).
2. T. Westermark, Energy distribution and energy stability of the electron beam from a 5 MeV betatron, Nucl. Instr. and Meth. (to be published).
3. E. Smårs and O. Wernholm, A 5 MeV betatron, Nucl. Instr. and Meth. (to be published).
4. Drs. Berger and Malch, Siemens Reiniger Werke, Erlangen, Germany. (Kind private communication); Their betatron is well described in Atomwirtschaft, (July–Aug.) (1959) p. 349.