Zembla
Bridges to Antiterra
Ada, the Wikipedia reference
NABOKV-L list archives (all Ada references)
The Kyoto Reading Circle, Annotations to Ada
Brian Boyd's Foreword to Jean Holabird's Vladimir Nabokov: Alphabet in Color
Dieter Zimmer's Antiterran Geography
French Nabokov Society (Chercheurs Enchantés)
NOJ (Nabokov Online Journal)

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