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4) Decreto 9 febbraio 1984 Restrizioni in materia di immissione sul mercato e di uso di talune sostanze e preparati pericolosi, in attuazione delle direttive comunitarie. https://www.gazzettaufficiale.it/gazzetta/serie_generale/caricaDettaglio?dataPubblicazioneGazzetta=1984-06-05&numeroGazzetta=153
5) CONOU, 203. Rapporto di Sotenibilità 2022. https://www.conou.it/comunicazione/rapporti-sostenibilita/
6) European Commission. Joint Research Centre., 2023. Environmental and socio-economic sustainability of waste lubricant oil management in the EU: a comparison of regeneration and energy recovery of waste oil. https://data.europa.eu/doi/10.2760/7597