Lorenzon, M. C. A.; Martinho, M. R.; Freire, J. A. H.; reis, F. P. Pollination Effect by Honeybees to Onion Hybrid Seed Production. PAB 1993, 28 (2), 229-235. https://doi.org/10.1590/S1678-3921.pab1993.v28.3870.