1. 89/392/EEC, 1989, 14th June, 1989 Council directive concerning approach of the legislation of the member States regarding machines, 29th June 1989
2. 91/368/EEC, 1991, 20th June 1991 Council directive modifying the 89/392/EEC directive concerning approach of the legislation of the member States regarding machines, 21st July 1991
3. Il rumore in agricoltura: livello sonoro di alcune macchine agricole e dose di rumore per gli operatori. [Noise in agriculture: sound level of some agricultural machines and dose of noise for the workers.];Artuso;Macchine e Motori Agricoli-IMA,1982
4. Sicurezza nei motocoltivatori. [Safety in walking tractors.];Cantarelli;L'Informatore Agrario,1992
5. Esame della rumorosità di motocoltivatori e motozappatrici. [Noise assessment of walking tractors and motor-hoes.];Capelli;Macchine e Motori Agricoli,1989