KRISTENSEN, P.; IRGENS, L. M. Multiple pregnancies among women engaged in agriculture in Norway. Norsk Epidemiologi, [S. l.], v. 9, n. 1, 2009. DOI: 10.5324/nje.v9i1.444. Disponível em: https://www.ntnu.no/ojs/index.php/norepid/article/view/444. Acesso em: 4 may. 2024.