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Pereira Assis Gomes, A. .; Araújo e Silva Ferraz, G. .; Bedin Marin, D.; Battemarco da Silva , F. .; Mendes dos Santos, L. .; Ferreira Ponciano Ferraz, P. . NOISE LEVELS EMITTED BY AGRICULTURAL TRACTORS WITH AND WITHOUT IMPLEMENTS ACTIVATION. NAT 2021, 9, 413-418.