Zahn, C. T. & Spees, A. A. (1938), "A Critical Analysis of the Classical Experiments on the Variation of Electron Mass", Physical Review, 53 (7): 511–521, Bibcode:1938PhRv...53..511Z, doi:10.1103/PhysRev.53.511
Rogers, M. M.; Rogers, F. (1940), "A Determination of the Masses and Velocities of Three Radium B Beta-Particles", Physical Review, 57 (5): 379–383, Bibcode:1940PhRv...57..379R, doi:10.1103/PhysRev.57.379
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Ritz, W. (1908), "Recherches critiques sur l'Ėlectrodynamique Générale", Annales de Chimie et de Physique, 13: 260–267, Bibcode:1908AChPh..13..145R
Zahn, C. T. & Spees, A. A. (1938), "A Critical Analysis of the Classical Experiments on the Variation of Electron Mass", Physical Review, 53 (7): 511–521, Bibcode:1938PhRv...53..511Z, doi:10.1103/PhysRev.53.511
Rogers, M. M.; Rogers, F. (1940), "A Determination of the Masses and Velocities of Three Radium B Beta-Particles", Physical Review, 57 (5): 379–383, Bibcode:1940PhRv...57..379R, doi:10.1103/PhysRev.57.379