1. On a Stationary System With Spherical Symmetry Consisting of Many Gravitating Masses
2. Die Grundlage der allgemeinen Relativitätstheorie
3. Fermi, E. (1967) Nuclear Physics, Course at the University of Chicago. The University of Chicago Press, Chicago, IL.
4. Wikipedia: The Free Encyclopedia. White Dwarf. https://en.wikipedia.org/wiki/White_dwarf
5. Donati, G. (2006) Il messaggero del campo elettomagnetico. ICPN, 80-84. https://www.academia.edu/8243576/THE_BOSON_OF_THE_ELECTROMAGNETIC_FIELD