I did a fair amount of research on the topic of Bely and Nabokov for a paper I presented on Fyodor's poetry in The Gift - feel free to contact me for more information.
Some of the more essential resources from the bibliography include:
Alexandrov, Vladimir E. “Nabokov and Bely.” The Garland Companion to Vladimir Nabokov. Ed. Vladimir E. Alexandrov. New York: Garland Publications, 1995.
Dear Bunny, Dear Volodya: The Nabokov-Wilson Letters, 1940-1971. Ed. Simon Karlinsky. Berkeley: University of California Press, 2001.
Johnson, D. Barton. “Belyj and Nabokov: A Comparative Overview.” Russian Literature 9.4 (1981): 379-402.
Karlinsky, Simon. “Nabokov and Some Poets of Russian Modernism.” Cycnos 12.2 (1995): 63-72
Smith, Gerald S. “Nabokov and Russian Verse Form.” Russian Literature Triquarterly 24 (1991): 271-305.
Joseph Schlegel
Ph.D. Candidate
University of Toronto
Dept. of Slavic Languages and Literatures