[31] Voir www.europa.eu.int/comm/environment/ipp/standard.pdf ainsi que Godenman, G., Hart, J. W., Sanz Levia, L (2002) The New Approach in Setting Product Standards for Safety, Environmental Protection and Human Health: Directions for the Future, Environmental News No. 66, Danish Environmental Protection Agency.
[31] Zie www.europa.eu.int/comm/environment/ipp/standard.pdf en Godenman, G., Hart, J. W., Sanz Levia, L (2002) The New Approach in Setting Product Standards for Safety, Environmental Protection and Human Health: Directions for the Future, Environmental News No. 66, Deens Bureau voor milieubescherming.