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18. Potential effects of accumulating environmental policies on Dutch dairy farms. Berentsen PB, Tiessink M. J Dairy Sci; 2003 Mar; 86(3):1019-28. PubMed ID: 12703639 [Abstract] [Full Text] [Related]
19. High nitrogen costs of dairy production in Europe: worsened by intensification. Bleken MA, Steinshamn H, Hansen S. Ambio; 2005 Dec; 34(8):598-606. PubMed ID: 16521834 [Abstract] [Full Text] [Related]