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In page Primary Chronicle:

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Numerous monographs and published versions of the chronicle have been made, the earliest known being in 1767. Aleksey Shakhmatov published a pioneering textological analysis of the narrative in 1908. Dmitry Likhachev and other Soviet scholars partly revisited his findings. Their versions attempted to reconstruct the pre-Nestorian chronicle, compiled at the court of Yaroslav the Wise in the mid-11th century.[citation needed]