1. Eddington .The Mathematical Theory of Relativity81–81. §37 and 82. (In Bεμνσ, ε is really the fourth suffix.
2. E109–109. §49 and 110.
3. E173–173. equation (73.74), putting Jμ=0 for empty space.
4. E171–171. equation (73.3).
5. E184–184. equation (77.7), the suffixvbeing raised.