* History and Poetics of the Russian Literature in 19-th and 20-th centuries (and especially: oeuvres of Pushkin, Gogol, Lermontov, Lev Tolstoy, A. Blok, A. Bely, V. Ivanov)
* Russian religious thought in the 19-th and in the beginning of 20-th centuries (and especially of Gogol, Lev Tolstoy, and Lev Shestov)