The Golden Oldies series of the journal General Relativity and Gravitation reprints important papers in general relativity theory that were published 30 or more years ago and are either hard to get hold of, or were originally printed in a language other than English.
Two recent works have been republished in October 2018:
Lichnerowicz, A., Republication of: Propagators, commutators and anti-commutators in general relativity, Gen Relativ Gravit (2018) 50: 145. https://doi.org/10.1007/s10714-018-2433-x
Editorial note by Giampiero Esposito is freely available at https://doi.org/10.1007/s10714-018-2440-y
Doroshkevich, A.G. and Novikov, I.D., Republication of: Mean density of radiation in the Metagalaxy and certain problems in relativistic cosmology, Gen Relativ Gravit (2018) 50: 138. https://doi.org/10.1007/s10714-018-2441-x
Editorial note by Ruth Durrer is freely available at https://doi.org/10.1007/s10714-018-2440-y