Kopta, T., M. Antal, M. Jurica, J. Volkova, and R. Pokluda. “The Influence of Synthetic Strigolactones and Plant Extracts on the Morphological Parameters of Onion (Allium Cepa)”. Advances in Horticultural Science, vol. 31, no. 4, June 2017, pp. 235-40, doi:10.13128/ahs-20517.