1. Eddington , A.S. 1926.The Internal Constitution of the Stars, 172–172. Cambrudge Univ. Press.
2. On Dense Matter
3. Jeans , J.H. l928.Astvonomy and Cosmogony, 156–156. Cambridge Univ. Press. ch. v
4. See, for example Birtwistle G.The New Quantum MechanicsCambridge Univ. Press 1928 243 243