Guidelines for the sustainable organisation of events : guide / Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB), Referat G I 4; German Environment Agency (UBA), Section III 1.3 ; Authors: Klaus-Michael Dubrikow, Dr. Ulf Jaeckel, Annette Schmidt-Räntsch (BMUB), Dr. Hans-Hermann Eggers und Dagmar Huth (UBA)