Graeff-Hönninger, S. , Pfenning, J. , Gutsal, V. , Wolf, S. , Zikeli, S. , Claupein, W. (2015). 'Antioxidant Capacity of Different Broccoli Cultivars at Various Harvesting Dates'. World Academy of Science, Engineering and Technology, Open Science Index 99, International Journal of Agricultural and Biosystems Engineering, 9(3), 346 - 349.