Waters appears (thinly veiled as "Sir Thomas Leseaux", an expert on theoretical magic) as a character in the Lord Darcy fantasy series by Randall Garrett and in Michael Kurland's The Unicorn Girl (1969) (in which he also appears, even more thinly veiled, as "Tom Waters").
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He himself wrote The Probability Pad (1970), a sequel to The Unicorn Girl; these two novels, together with Chester Anderson's earlier The Butterfly Kid (1967), make up the collaborative Greenwich Village Trilogy.