Hydra Code Release
  A revised version of Hydra, an adaptive particle-particle, particle-mesh plus smoothed particle hydrodynamics code developed by; Hugh Couchman, University of Western Ontario, Frazer Pearce, University of Durham, Peter Thomas, University of Sussex, is now available as a tar file from; http://coho.astro.uwo.ca/pub/hydra/hydra.html or http://star-www.maps.susx.ac.uk/~pat/hydra/hydra.html . 
H.M.P.Couchman, F.R.Pearce, P.A.Thomas