Modelling the spread of ragweed: Effects of habitat, climate change and diffusion G. Vogl, M. Smolik, L.-M. Stadler, M. Leitner, F. Essl, S. Dullinger, I. Kleinbauer and J. Peterseil Eur. Phys. J. Special Topics, 161 (2008) 167-173 Published online: 19 June 2008 DOI: 10.1140/epjst/e2008-00758-y