Each person non resident of the Russian Federation prior to applying for visa in the consulate must get an invitation according to the purpose of his or her visit.
Your Visa To Russia provides invitations for tourist and business trips.

Literaturnaya gazeta

Founded in 1830 by Alexander Pushkin and Anton Delvig, this important newspaper has long been something of a bellweather for Russia's relationship to literature...

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Source: http://www.russianlife.com/article.cfm?Number=2147