Sonnenberg, Peter Ernst. “COMPETITION BETWEEN SEVEN LETTUCE VARIETIES IN THE HOT SEASON IN GOIÂNIA, BRAZIL”. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics] 1, no. 1 (September 5, 2007): 16–21. Accessed October 7, 2026. https://teste.revistas.ufg.br/pat/article/view/1656.