Dieter Zimmer wrote Re André Gide. The Gide reference in 'Pale
Fire' is not to 'L'immoraliste' but to his travel diaries 'Voyage au Congo' and
'Retour du Tchad' (1927-28) which Nabokov must have known... Gide, he
said, knew nothing of life but perhaps his descriptions of Arab youths
aren't too bad, "a sort of candied fruit".
JM: Didn't VN also mention "La Symphonie
Pastorale"? I have a vague recollection about finding it mentioned (either
explicitly or only indirectly) in ADA.