ROCHARD, J B A; KEAR, Janet. A trial to investigate the reactions of sheep to goose droppings on grass. Wildfowl, [S. l.], v. 19, p. 117–119, 1968. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154494. Acesso em: 4 apr. 2026.