Witter, Sidia, and Betina Blochtein. “Effect of Pollination by Bees and Other Insects on the Production of Onion Seeds”. Pesquisa Agropecuaria Brasileira 38, no. 12 (December 1, 2003): 1399–1407. Accessed November 18, 2025. https://apct.sede.embrapa.br/pab/article/view/6717.