1. M. Abraham, Prinzipien der Dynamik des Elektrons, Physikal. Zeitschr. 4, 57–63 (1902)
2. M. Abraham, Theorie der Elektrizität, Bd.2: Elektromagnetische Theorie der Strahlung (Teubner, Leipzig, 1905)
3. V.I. Arnold, B.S. Khesin, Topological Methods in Hydrodynamics (Springer, New York, 1998)
4. N. Bohr, On the constitution of atoms and molecules, Philos. Mag. 26, 1–25, 476–502, 857–875 (1913)
5. N. Bohr, Discussion with Einstein on epistemological problems in atomic physics, in Albert Einstein: Philosopher-Scientist, ed. by Schilpp, P.A. Library of Living Philosophers, vol. 7 (Evanston, Illinois, 1949), pp 201–241