Green bridges, wildlife tunnels and fauna culverts : the biodiversity approach : executive summary of the research + development project "BfN-defragmentation handbook" (FKZ 3511 82 1200) / Heinrich Reck, Kersten Hänel, Martin Strein, Bertram Georgii, Michael Henneberg, Elke Peters-Ostenberg, Marita Böttcher ; BfN, Federal Agency for Nature Conservation
