FRITZSCHE, Stephan; WITZEL, Ernst. Investitionsbedarf in der Ferkelproduktion. agricultural-engineering.eu, [S. l.], v. 63, n. 3, p. 176–177, 2008. DOI: 10.15150/lt.2008.812. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/2008-63-3-176-177. Acesso em: 29 märz. 2024.