M. G. P. dos Santos, W. F. da Mota, J. C. B. Vieira, V. J. G. Mota Filho, and R. P. Madureira, “Vernalization and cut of apical third of the bulbs in yield and quality of seeds of onion”, Semina: Ciênc. Agrár., vol. 33, no. 3, pp. 989–996, Jun. 2012.