A. Sklyarenko:D'Onsky's son, a person with only one arm...It belatedly occurs to me (better late than never!) that Cervantes was one-armed. The author of Don Quixot is mentioned in Ada (3.6):
"One of Osberg's concoctions" mentioned by Demon must be his novel The Gitanilla. The gitanilla's name is Lolita
 
JM: I'm no expert on Quixote but, as I recollect it, he loast the use of his left hand, not the entire arm.
In one of his interviews Nabokov observes that he's lent Lolita's authorship to one of his  inventions, Osberg.  I don't remember the exact words. Both items deserve further checkings...
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