I am aware that Dover has a compendium of some of the early works from 1907-1926 (I think), but I am looking for later ones, specifically the papers of Vladimir Fock in Z. Phys. where he develops the Fock operator, and the Dirac-Fock operator (these are from 1929-1931 I think). I can sort of muddle through the original German, but I wouldn't want to make a silly translation error. Does anyone know if these papers have been republished in English? Thanks in advance for any help.