. . . "I." . "N." . "Igor Nikitin" . "Igorʹ"@en . "И. Н Никитин"@en . "Igor Nikitin" . "Igor" . "I. N." . . "Igorʹ Nikitin"@en . "Nikitin, I. N. (Ivan Nikolaevich)" . "Igor'" . "Igor' Nikolaevič Nikitin"@pl-PL . "Igor N. Nikitin" . . "Nikolaevich" . "Nikolaevič" . "И. Н. Никитин"@lv-LV . "Nikitin"@en . "Ivan Nikolaevich Nikitin" . "Igor N." . . . "I. N. Nikitin" . "Ivan" . . "I. N. Nikitin" .