Martin Kieffer; Michael P. Fuller; Anita J. Jellings (iulie 1998). „Explaining Curd and Spear Geometry in Broccoli, Cauliflower and 'Romanesco': Quantitative Variation in Activity of Primary Meristems”. Planta(d). 206 (1): 34–43. doi:10.1007/s004250050371.
Martin Kieffer; Michael P. Fuller; Anita J. Jellings (iulie 1998). „Explaining Curd and Spear Geometry in Broccoli, Cauliflower and 'Romanesco': Quantitative Variation in Activity of Primary Meristems”. Planta(d). 206 (1): 34–43. doi:10.1007/s004250050371.