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P. Weinzierl
[1] J. Dosse. Zur Ausmessung des Feldes magnetischer Elektronenlinsen , 1941 .
[2] A. W. Hull. The Measurement of Magnetic Fields of Medium Strength by Means of a Magnetron , 1923 .
[3] A. W. Hull. The Effect of A Uniform Magnetic Field on the Motion of Electrons Between Coaxial Cylinders. , 1921 .