PAATELA, J.; HEINRICHS, H. Measuring of the nectar yield of red clover heads. Agricultural and Food Science, [S. l.], v. 32, n. 1, p. 88–95, 1960. DOI: 10.23986/afsci.71510. Disponível em: https://journal.fi/afs/article/view/71510. Acesso em: 30 apr. 2024.