An addendum to my previous post:
In his student years Afanasiy Fet lived at the Moscow
house of his fellow student and friend, the poet Apollon Grigoriev. As he
speaks to Troshcheykin, Barboshin quotes a line from Grigoriev's most famous
poem (quoted also in Ada): Но вы так хороши, и
ночь такая лунная... (But you are so beautiful and the
night is so moonlit: "The Event," Act Three).
On the other hand, Fet's and Grigoriev's professor at the
Moscow University was Mikhail Pogodin (the author of "Марфа
посадница").
Alexey Sklyarenko