ER, F., et al. “The Effect of Different Ways and Dosages of Boron Application on Black Dimrit (Vitis Vinifera L.) Grape’s Yield and Quality”. Bulgarian Journal of Agricultural Science, vol. 17, no. 4, Aug. 2011, pp. 544-50, https://agriacad.eu/ojs/index.php/bjas/article/view/6016.