Observables at infinity and states with short range correlations in statistical mechanics O. E. Lanford IIID. Ruelle OriginalPaper Pages: 194 - 215
Irreducible Lie algebra extensions of the Poincaré algebra U. Cattaneo OriginalPaper Pages: 226 - 245
On the most general linear theory of gravitation Otto NachtmannHarald SchmidleRoman U. Sexl OriginalPaper Pages: 254 - 256