Influence of citrate-stabilized Cu- and Mn-nano• colloids on the growth and proliferative activity of Allium cepa L. apical meristems - Ye. O. Konotop; L. A. Karpets; A. V. Zinchenko; S. K. Lopatko; M. S. Kovalenko; Ye. Smirnov (Reports of the National Academy of Sciences of Ukraine, 2019)