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* Κομητική πτώση της Τουνγκούσκα 1908* the tunguska event in 1908: evidence from tree-ring anatomy - evgenii a. vaganov, malkolm k. hughes, pavel p. silkin and valery d. nesvetailo, "astrobiology", τ.
* the tunguska event in 1908: evidence from tree-ring anatomy – evgenii a. vaganov, malkolm k. hughes, pavel p. silkin and valery d. nesvetailo, astrobiology, volume 4, number 3, 2004, pp.
