"Tkačenko" . . "Mikhailovich" . "V.M." . . "Viktor Mikhailovich Tkachenko" . "Viktor Mihailovič Tkačenko"@pl-PL . "V.M. Tkachenko" . . . "V.M. Tkačenko"@en . . "Mikhaĭlovich"@en . "Viktor Mikhailovich" . "Tkachenko"@en . "Viktor"@en . "V. M." . "Viktor M. Tkačenko"@de-DE . "Viktor Mikhailovich Tkachenko" . "V. M. Tkačenko" . "V. M. Tkachenko" . "Mihailovič" . "Viktor Mikhaĭlovich Tkachenko"@en . . .