EDNOTE. Oleg Dorman calls attention to an electronic copy of Benedikt Sarnov's Russian-language article "Larets s sekretom: (O zagadkax i allyuziiiax v russkix romax V. Nabokova"  (A Chest with a Secret: On puzzles and Allusions in Nabokov's Russian Novels). It orignally appeared in _Voprosy literatury_, #3, 1999)