G.F.R. Ellis, Professor of Mathematics, University of Cape Town, South Africa. R.M. Williams, Assistant Director of Research, Department of Applied Mathematics and Theoretical Physics, University of Cambridge
G.Ellis and R. Williams two seasoned and wellknown Relativists, have done a super job in suceeding to present just the facts and at the same time make their book a pleasure to read, even for motivated, non-experts * European Astronomical Society Newsletter *