انظر: Köhl, M., Traub, B. and Paivinen, R., 2000 &quot; Harmonisation and Standardisation in Multi-National Environmental Statistics - Mission Impossible? &quot; Environmental Monitoring and Assessment.
Köhl, M., Traub, B. and Paivinen, R., 2000, &quot; Harmonisation and Standardisation in Multi-National Environmental Statistics -- Mission Impossible? &quot; , Environmental Monitoring and Assessment.