1. Ein Neues Massenspektrometer ohne Magnetfeld. (A New Mass Spectrometer without a Magnetic Field.);Paul;Z. Naturforsch.,1953
2. Paul, W.; Steinwedel, H. Apparatus for Separating Charged Particles of Different Specific Charges. German Patent 944,900, 1956 (filed 23 December, 1953; also U.S. Patents 2,939,952 and 2,950,389, 1960).
3. Post, R. F.; Heinrich, L. In: Summary of the Research Progress Meetings of February 12, 19, and 26, 1953, University of California Radiation Laboratory Report. UCRL 2209; Shewchuck, S., Ed., UCRL: Berkeley, CA, USA, 1953.
4. Good, M. L. A Proposed Particle Containment Device: University of California Radiation Laboratory Report UCRL-4146. UCRL: Berkeley, CA, USA, 1953.
5. The strong-focusing synchrotron: a new high energy accelerator;Courant;Phys. Rev.,1952