Relativistic Wave Equations and Hydrogenic Atoms
  The transition probabilities for the components of both the Balmer and Lyman $\alpha$-lines of hydrogenic atoms are calculated for the nonrelativistic Schrodinger theory, the Dirac theory and the recently developed eight-component formalism. For large $Z$ it is found that all three theories give significantly different results. 
B. A. Robson and S. H. Sutanto