[124] Voir AEE, 2002: Environmental Signals 2002 - Benchmarking the millennium, Environmental assessment report N. 9, Copenhague: Agence européenne pour l'Environnement, chapitre 12, pp. 100-105.
[124] EMA, 2002: Environmental Signals 2002 - Benchmarking the millennium, Environmental assessment report N. 9, Kopenhagen: Europees Milieuagentschap, hoofdstuk 12, blz. 100-105.