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pseudonyms.
Andre Norton and James Tiptree were two pseudonyms used by female authors.
Andrew Bauer has written:
'The Hawthorn dictionary of pseudonyms' -- subject(s): Anonyms and pseudonyms
Amitabha Chatterjee has written:
'Dictionary of Indian pseudonyms' -- subject(s): Indic Anonyms and pseudonyms
John Lennon, using one of his many pseudonyms.