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Єременко, О.А., Калитка, В.В. and Каленська, С.М. 2017. Influence of growth regulator on plant growth, development and yield formation of sunflower hybrids (F<sub>1</sub>) under the conditions of Southern Steppe zone of Ukraine. Plant varieties studying and protection. 13, 2 (Jun. 2017), 141–149. DOI:https://doi.org/10.21498/2518-1017.13.2.2017.105395.