Disturbances in dwarf stars caused by nuclear reactions and gas diffusion. - The chemical composition of white dwarfs. Reprinted from the Mémoires in-8o de la Société Royale des Sciences de Liège, 4-me S., tome 14, Fasc. unique, nos. 11 and 6, 1953.
Öpik, Ernst Julius.
[Dublin, 
1954]