HEROLD, Bernd; TRUPPEL, Lngo; GEYER, Martin. Farb- und Reifebestimmung an Äpfeln. agricultural engineering.eu, [S. l.], v. 54, n. 6, p. 342–343, 1999. DOI: 10.15150/lt.1999.2165. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/1999-54-6-342-343. Acesso em: 4 mai. 2024.