Diffuse Matter from Star Forming Regions to Active Galaxies A Volume Honouring John Dyson - Hartquist, T.W.; Hartquist, T.W.; Pittard, J. M.; Pittard, J. M.; Falle, S.A.E.G.; Falle, S.A.E.G. (Springer Netherlands : Imprint: Springer, 2007)