On quadratic first integrals of the geodesic equations for type {22} spacetimes Martin WalkerRoger Penrose OriginalPaper Pages: 265 - 274
On the mathematical description of quantized fields R. AscoliG. EpifanioA. Restivo OriginalPaper Pages: 291 - 300
Non-factor quasi-free states of the CAR-algebra J. ManuceauA. Verbeure OriginalPaper Pages: 319 - 326